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Posted: 11/18/2014 9:11:13 PM EDT
[#1]
I asked CCI if their 400 primers were OK for AR15s and this was their response:
Michael, the CCI 400 primer has a standard cup and you may get slam fires with this primer. You may want to look at the CCI 41 or the CCI BR4 primer.
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Posted: 11/18/2014 9:14:23 PM EDT
[#2]
I use Wolf/Tula for 223, never had an issue except maybe 5 bad primers (missing anvil) in 10,000+. I used a few hundred Remington 6 1/2 I think and they worked fine. That number may be wrong it was whichever ones are ok for an AR.
ETA - If you find a good deal on the 41's they average out to about $1-3 more per k in my area. I'd buy the 41's if the price was right. The Wolf/Tula's were $14.50 per k when I bought them in early 2012. |
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Posted: 11/18/2014 9:16:50 PM EDT
[#3]
Quote HistoryQuoted:
I use Wolf/Tula for 223, never had an issue except maybe 5 bad primers (missing anvil) in 10,000+. I used a few hundred Remington 6 1/2 I think and they worked fine. That number may be wrong it was whichever ones are ok for an AR. ETA - If you find a good deal on the 41's they average out to about $1-3 more per k in my area. I'd buy the 41's if the price was right. The Wolf/Tula's were $14.50 per k when I bought them in early 2012. I've always used the 41s. Midway does a blow out sale of them every now and then where they aren't much more than the normal magnums, so it has always been worth the tiny extra cost to me for the security of the harder cup. |
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Posted: 11/18/2014 9:29:25 PM EDT
[#4]
I've used 400s in a pinch, but back my loads down a tad. Usually I use the #41s or the #450s.
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Posted: 11/18/2014 9:54:53 PM EDT
[#5]
I also have used nothing but CCI #41's for my AR, yes I feel they are worth it.
V |
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Posted: 11/18/2014 10:04:12 PM EDT
[#6]
I like em. My friend uses 400's all the time. Says they are fine. Of course this is the same friend popping primers with 300BO supers.
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Posted: 11/18/2014 10:52:23 PM EDT
[#7]
I've used Winchester WSR primers for about 1000 rounds.
So far, no issues. I seat them deep to prevent slam-fire problems. |
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Posted: 11/18/2014 10:56:44 PM EDT
[#8]
No.
I exclusively use CCI 450 primers and see no reason to go beyond. That said, below is some useful information to make your own determination. CCI 400 -thin .020" cup, not recommended for AR15 type use by CCI. CCI BR4 - match primer with a thicker .025" cup. CCI 450 - same thicker .025" cup as the BR4 and #41. CCI #41 - .025" thick cup. COMMERCIAL version of the fully-qualified DOD primer for use in U.S. military ammo. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup than with other CCI SR primers. Same primer mix as CCI 450. CCI states: "The CCI 400 primer does have a thinner cup bottom than CCI 450, #41 or BR4 primers. The appropriate primer for an AR15 platform is the CCI #41 primer, which helps to prevent slamfires. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup." [as per: Linda Olin - CCI/Speer Technical Services]. NOTE : According to Speer/CCI Technical Services - Both the CCI 550 Small Pistol Magnum and CCI 400 Small Rifle primers are identical in size. Both primers use the same cup metal and share the same cup thickness. Both primers use the same primer compound formula and same amount of primer compound. They can be used interchangeably. Cases that utilize Small Rifle Primers and operate at moderate pressures(40,000 psi) should use CCI 400, Federal 200, Rem 6 1/2, or Win WSR. Cases that utilize Small Rifle Primers and operate at higher pressures (55,000 psi) should use CCI 450, CCI BR4, Fed 205 and Rem 7 1/2 etc. |
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Posted: 11/19/2014 7:06:33 AM EDT
[#9]
Thank You all. Then I do not feel to Bad as I purchased the CCI-41's from Graf & Sons as they are on sale for $179.99 for a sleeve. Plus of course the Gooberment Hazmat Charge and $7.95 Shipping.
A few replies kinda drove it home that to use a Primer Expressly designed for the AR Platform will give some cheap insurance. Or so that is how I am thinking. As usual Thank You everyone for your insight. Just an FYI Graf & Sons has a SALE on Primers. CCI-450's for $129.99 per sleeve. |
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Posted: 11/19/2014 10:09:43 AM EDT
[#10]
I have used thousands of 400's and Win standard SR in multiple AR15's with zero ill effects. No worries!
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Posted: 11/19/2014 11:02:17 AM EDT
[#11]
I have never tried the 41s...the supply is too haphazard, so I have always used the Remington 7 1/2 BRs (thousands and thousands of them). They're great primers for AR15/semi-auto reloading. Sometimes the supply of those gets sketchy, too, but I have always kept plenty on hand. I think I have about 7k in the cabinet right now.
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Posted: 11/19/2014 11:22:02 AM EDT
[#12]
They are only $35/1k around here. They have always been consistent,
and I have had decent accuracy with all loads. I have never seen Wolf primers in my area, but CCI's are made here, so I keep the locals employed. 
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Posted: 11/19/2014 11:56:14 AM EDT
[#13]
Quote HistoryQuoted:
I seat them deep to prevent slam-fire problems. Which in reality means, you seat them properly - there's no way to seat them any 'deeper' shot of crushing the anvil, really. @OP - take a look at the cup thickness posted by someone up-thread. I have and use CCI 41s, but also will and use any mfgrs magnum or thick cupped primers - Rem 7 1/2, Tula/Wolf SRM/SRM 5.56, CCI #450, etc. |
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Posted: 11/19/2014 12:16:45 PM EDT
[#14]
I use 41s when I get in prepper mode and load up a bunch of 5.56 pressure ball powder ammo I intend to stow away.
After some consideration though I doubt I'll be buying them again, I have loaded a few thousand rounds with WSRs without issue, and used Remington, CCI and Wolf .223 suitable primers without issue, yeah they dimple, so do the 41s. Generally no round is going to be rechambered more than 2/3 times in my uses. 41s are $6-9 more here per K and sometimes hard to find, not worth it. |
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Posted: 11/19/2014 12:18:47 PM EDT
[#15]
I have used CCI-BR4's in .223 teamed with 24.5 grains of Varget and 69 grain Sierra Match Kings seated @ 2.250" as my standard match load for NRA 200/300 yard stages for years now. Around 5000 rounds fired with excellent results. This load has been suggested by several high masters and is very accurate in every rifle I tried it in, extremely accurate in some. This load is .5 grain below Sierra maximum, but has never shown any signs of pressure in any rifle I know of. Velocity is 2750 fps +/- from a 20" barrel.
I was told that this primer works well with Varget in .223 and it does. I have used Remington 7.5's and Wolf kvb5,56m (magnum) primers with excellent results as well. Most small rifle primers will work provided you don't push the envelope powder wise. Stay away from Wolf standard small rifle primers and Remington 6.5's for any use and Winchester small rifle primers and CCI-400's shouldn't be used for full power loads. |
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Posted: 11/19/2014 12:55:06 PM EDT
[#16]
I have been using standard primers in all my AR's. Many thousands of rounds using CCI 400, WSR, and Federal 205 & 205M and never encountered a slam fire. Likewise in the military, never saw or heard of one in my area of service. The only one I have heard about was some ammo loaded on a progressive press that needed the primer seating depth adjusted.
By all means, use the 41's or others if it matters to you, but the cup thickness difference is miniscule compared to the thousands, perhaps millions of rounds of commercial .223 that use non magnum primers. If one uses all safe weapon handling procedures when operating a AR15/10, if a slam fire occurs, you have dealt with any danger to yourself and others. We haven't yet seen one happen in dozens of different firearms, expending thousands of rounds in 3Gun or multi-gun practice and matches. With all that said, observe all safe handling practices to prevent ND's and the possible random slam fire. |
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Posted: 11/19/2014 1:25:16 PM EDT
[#17]
How many millions of rounds have been loaded with standard primers and there's not story after story of slam fires?
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Posted: 11/19/2014 4:25:38 PM EDT
[#18]
400s will show false pressure signs in a NATO pressure or near NATO pressure round. They are also thin enough that at higher pressures they are more prone to being pierced and can cause damage in your firing pin hole in the bolt.
The other thing, is the 450 and the 41 are both magnum primers. More consistent ignition, and with some powders you need it. |
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Posted: 11/21/2014 12:23:53 AM EDT
[#19]
I use 400s. Just make sure your firing pin isn't defomed and only rechamber a round gently.
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Posted: 11/21/2014 1:06:43 PM EDT
[#20]
I've used about 3K CCI 400s. No slam fires.
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Posted: 11/21/2014 1:40:23 PM EDT
[#21]
So could one use the CCI 400 to load 9mm?
Quote HistoryQuoted:
No. I exclusively use CCI 450 primers and see no reason to go beyond. That said, below is some useful information to make your own determination. CCI 400 -thin .020" cup, not recommended for AR15 type use by CCI. CCI BR4 - match primer with a thicker .025" cup. CCI 450 - same thicker .025" cup as the BR4 and #41. CCI #41 - .025" thick cup. COMMERCIAL version of the fully-qualified DOD primer for use in U.S. military ammo. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup than with other CCI SR primers. Same primer mix as CCI 450. CCI states: "The CCI 400 primer does have a thinner cup bottom than CCI 450, #41 or BR4 primers. The appropriate primer for an AR15 platform is the CCI #41 primer, which helps to prevent slamfires. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup." [as per: Linda Olin - CCI/Speer Technical Services]. NOTE : According to Speer/CCI Technical Services - Both the CCI 550 Small Pistol Magnum and CCI 400 Small Rifle primers are identical in size. Both primers use the same cup metal and share the same cup thickness. Both primers use the same primer compound formula and same amount of primer compound. They can be used interchangeably. Cases that utilize Small Rifle Primers and operate at moderate pressures(40,000 psi) should use CCI 400, Federal 200, Rem 6 1/2, or Win WSR. Cases that utilize Small Rifle Primers and operate at higher pressures (55,000 psi) should use CCI 450, CCI BR4, Fed 205 and Rem 7 1/2 etc. Posted Via AR15.Com Mobile |
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Posted: 11/21/2014 6:02:27 PM EDT
[#22]
Quote HistoryQuoted: So could one use the CCI 400 to load 9mm? Posted Via AR15.Com Mobile Quote HistoryQuoted: So could one use the CCI 400 to load 9mm? Quoted: No. I exclusively use CCI 450 primers and see no reason to go beyond. That said, below is some useful information to make your own determination. CCI 400 -thin .020" cup, not recommended for AR15 type use by CCI. CCI BR4 - match primer with a thicker .025" cup. CCI 450 - same thicker .025" cup as the BR4 and #41. CCI #41 - .025" thick cup. COMMERCIAL version of the fully-qualified DOD primer for use in U.S. military ammo. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup than with other CCI SR primers. Same primer mix as CCI 450. CCI states: "The CCI 400 primer does have a thinner cup bottom than CCI 450, #41 or BR4 primers. The appropriate primer for an AR15 platform is the CCI #41 primer, which helps to prevent slamfires. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup." [as per: Linda Olin - CCI/Speer Technical Services]. NOTE : According to Speer/CCI Technical Services - Both the CCI 550 Small Pistol Magnum and CCI 400 Small Rifle primers are identical in size. Both primers use the same cup metal and share the same cup thickness. Both primers use the same primer compound formula and same amount of primer compound. They can be used interchangeably. Cases that utilize Small Rifle Primers and operate at moderate pressures(40,000 psi) should use CCI 400, Federal 200, Rem 6 1/2, or Win WSR. Cases that utilize Small Rifle Primers and operate at higher pressures (55,000 psi) should use CCI 450, CCI BR4, Fed 205 and Rem 7 1/2 etc. Posted Via AR15.Com Mobile The Rifle cup should be taller than the pistol. |
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Posted: 11/21/2014 6:07:58 PM EDT
[#23]
CCI #41 is most successful marketing campaign in reloading history.
Definitely not needed in ARs to prevent slam fires. The CCI 450 is excellent for AR, I recently switched to Tula/Wolf KVB556M primers, no problems in 5,000+ rounds and they can be quite a bit cheaper than CCI when buying in bulk. |
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Posted: 11/21/2014 6:15:08 PM EDT
[#24]
Quote HistoryQuoted:
I have used thousands of 400's and Win standard SR in multiple AR15's with zero ill effects. No worries! This! |
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Posted: 11/21/2014 6:46:19 PM EDT
[#25]
Quote HistoryQuoted:
So could one use the CCI 400 to load 9mm? Posted Via AR15.Com Mobile Quote HistoryQuoted:
So could one use the CCI 400 to load 9mm? Quoted:
No. I exclusively use CCI 450 primers and see no reason to go beyond. That said, below is some useful information to make your own determination. CCI 400 -thin .020" cup, not recommended for AR15 type use by CCI. CCI BR4 - match primer with a thicker .025" cup. CCI 450 - same thicker .025" cup as the BR4 and #41. CCI #41 - .025" thick cup. COMMERCIAL version of the fully-qualified DOD primer for use in U.S. military ammo. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup than with other CCI SR primers. Same primer mix as CCI 450. CCI states: "The CCI 400 primer does have a thinner cup bottom than CCI 450, #41 or BR4 primers. The appropriate primer for an AR15 platform is the CCI #41 primer, which helps to prevent slamfires. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup." [as per: Linda Olin - CCI/Speer Technical Services]. NOTE : According to Speer/CCI Technical Services - Both the CCI 550 Small Pistol Magnum and CCI 400 Small Rifle primers are identical in size. Both primers use the same cup metal and share the same cup thickness. Both primers use the same primer compound formula and same amount of primer compound. They can be used interchangeably. Cases that utilize Small Rifle Primers and operate at moderate pressures(40,000 psi) should use CCI 400, Federal 200, Rem 6 1/2, or Win WSR. Cases that utilize Small Rifle Primers and operate at higher pressures (55,000 psi) should use CCI 450, CCI BR4, Fed 205 and Rem 7 1/2 etc. Posted Via AR15.Com Mobile Yes they are the same height and diameter. LRP and LPP are different in height. |
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Posted: 11/22/2014 12:55:00 AM EDT
[#26]
I don't know how many thousands of rounds I have loaded using 400's, but the number is high. I have experienced 1 popped primer and 0 slam fires.
Some day I will try the 41's, but i am in no hurry... |
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Posted: 11/22/2014 1:12:01 AM EDT
[#27]
Quote HistoryQuoted:
I have used thousands of 400's and Win standard SR in multiple AR15's with zero ill effects. No worries! Same here. Never a single issue. |
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Posted: 11/22/2014 1:40:20 AM EDT
[#28]
Bunch of 400s fired. No issues. I do have some 41s but saving them for a SHTF type day.
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Posted: 11/22/2014 2:27:38 AM EDT
[#29]
Quote HistoryQuoted:
The Rifle cup should be taller than the pistol. Quote HistoryQuoted:
Quoted:
So could one use the CCI 400 to load 9mm? Quoted:
No. I exclusively use CCI 450 primers and see no reason to go beyond. That said, below is some useful information to make your own determination. CCI 400 -thin .020" cup, not recommended for AR15 type use by CCI. CCI BR4 - match primer with a thicker .025" cup. CCI 450 - same thicker .025" cup as the BR4 and #41. CCI #41 - .025" thick cup. COMMERCIAL version of the fully-qualified DOD primer for use in U.S. military ammo. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup than with other CCI SR primers. Same primer mix as CCI 450. CCI states: "The CCI 400 primer does have a thinner cup bottom than CCI 450, #41 or BR4 primers. The appropriate primer for an AR15 platform is the CCI #41 primer, which helps to prevent slamfires. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup." [as per: Linda Olin - CCI/Speer Technical Services]. NOTE : According to Speer/CCI Technical Services - Both the CCI 550 Small Pistol Magnum and CCI 400 Small Rifle primers are identical in size. Both primers use the same cup metal and share the same cup thickness. Both primers use the same primer compound formula and same amount of primer compound. They can be used interchangeably. Cases that utilize Small Rifle Primers and operate at moderate pressures(40,000 psi) should use CCI 400, Federal 200, Rem 6 1/2, or Win WSR. Cases that utilize Small Rifle Primers and operate at higher pressures (55,000 psi) should use CCI 450, CCI BR4, Fed 205 and Rem 7 1/2 etc. Posted Via AR15.Com Mobile The Rifle cup should be taller than the pistol. Thanks. I'm going to load a couple and find out. |
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Posted: 11/22/2014 2:28:43 AM EDT
[#30]
Quote HistoryQuoted:
Yes they are the same height and diameter. LRP and LPP are different in height. Quote HistoryQuoted:
Quoted:
So could one use the CCI 400 to load 9mm? Quoted:
No. I exclusively use CCI 450 primers and see no reason to go beyond. That said, below is some useful information to make your own determination. CCI 400 -thin .020" cup, not recommended for AR15 type use by CCI. CCI BR4 - match primer with a thicker .025" cup. CCI 450 - same thicker .025" cup as the BR4 and #41. CCI #41 - .025" thick cup. COMMERCIAL version of the fully-qualified DOD primer for use in U.S. military ammo. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup than with other CCI SR primers. Same primer mix as CCI 450. CCI states: "The CCI 400 primer does have a thinner cup bottom than CCI 450, #41 or BR4 primers. The appropriate primer for an AR15 platform is the CCI #41 primer, which helps to prevent slamfires. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup." [as per: Linda Olin - CCI/Speer Technical Services]. NOTE : According to Speer/CCI Technical Services - Both the CCI 550 Small Pistol Magnum and CCI 400 Small Rifle primers are identical in size. Both primers use the same cup metal and share the same cup thickness. Both primers use the same primer compound formula and same amount of primer compound. They can be used interchangeably. Cases that utilize Small Rifle Primers and operate at moderate pressures(40,000 psi) should use CCI 400, Federal 200, Rem 6 1/2, or Win WSR. Cases that utilize Small Rifle Primers and operate at higher pressures (55,000 psi) should use CCI 450, CCI BR4, Fed 205 and Rem 7 1/2 etc. Posted Via AR15.Com Mobile Yes they are the same height and diameter. LRP and LPP are different in height. I've read where in a pinch people have used small rifle primer in place of small pistol primer. I'm going to load a couple and find out. |
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Posted: 11/22/2014 8:52:15 AM EDT
[#31]
In a pinch?? I do it all the time!
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Posted: 11/22/2014 9:28:21 AM EDT
[#32]
Experimental Studies of the No. 41 Primer and Ignition
of 5.56-mm Ammunition. http://www.dtic.mil/dtic/tr/fulltext/u2/a456635.pdf |
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Posted: 11/22/2014 10:40:30 AM EDT
[#33]
I have used 400's without issue but I would like to stay with 41's in the AR. (the 41's are $50 per 1000 here) I will try the 450's
The Small Rifle primer used for small pistol has been covered few times. I have used the Rem 6 1/2 for small pistol with zero problems but those are the only primers I have tried. I found the info below here CCI Small Pistol (500) - 5.50ftlb CCI Small Pistol Magnum (550) - 8.80ftlb CCI Small Rifle (400) - 6.00ftlb CCI Small Rifle Magnum (450) 7.20ftlb Will the hammer strike the primer hard enough? http://www.ar15.com/archive/topic.html?b=6&f=42&t=389834 More on Primer thickness and various primers http://www.ar15.com/archive/topic.html?b=6&f=42&t=392854 |
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Posted: 11/22/2014 10:47:17 AM EDT
[#34]
Quote HistoryQuoted:
So could one use the CCI 400 to load 9mm? Posted Via AR15.Com Mobile Quote HistoryQuoted:
So could one use the CCI 400 to load 9mm? Quoted:
No. I exclusively use CCI 450 primers and see no reason to go beyond. That said, below is some useful information to make your own determination. CCI 400 -thin .020" cup, not recommended for AR15 type use by CCI. CCI BR4 - match primer with a thicker .025" cup. CCI 450 - same thicker .025" cup as the BR4 and #41. CCI #41 - .025" thick cup. COMMERCIAL version of the fully-qualified DOD primer for use in U.S. military ammo. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup than with other CCI SR primers. Same primer mix as CCI 450. CCI states: "The CCI 400 primer does have a thinner cup bottom than CCI 450, #41 or BR4 primers. The appropriate primer for an AR15 platform is the CCI #41 primer, which helps to prevent slamfires. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup." [as per: Linda Olin - CCI/Speer Technical Services]. NOTE : According to Speer/CCI Technical Services - Both the CCI 550 Small Pistol Magnum and CCI 400 Small Rifle primers are identical in size. Both primers use the same cup metal and share the same cup thickness. Both primers use the same primer compound formula and same amount of primer compound. They can be used interchangeably. Cases that utilize Small Rifle Primers and operate at moderate pressures(40,000 psi) should use CCI 400, Federal 200, Rem 6 1/2, or Win WSR. Cases that utilize Small Rifle Primers and operate at higher pressures (55,000 psi) should use CCI 450, CCI BR4, Fed 205 and Rem 7 1/2 etc. Posted Via AR15.Com Mobile I use CCI 400s in my 40. One less type of primer to buy. I have CCI 400s, Remington 6.5s and 7.5s in my loading cabinet right now. I've shot all with 223 in bolt, and semi auto. I've never had a problem except the few I loaded following the OCW method and the primer was pierced through the bottom which was enough for me to say I've reached maximum for this load. I've read the BR primers are more consistent because they're made by select individuals at the company and the assembly line is moved by hand, and not by a machine. |
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Posted: 11/22/2014 1:38:10 PM EDT
[#35]
Quote HistoryQuoted:
So could one use the CCI 400 to load 9mm? Posted Via AR15.Com Mobile Quote HistoryQuoted:
So could one use the CCI 400 to load 9mm? Quoted:
No. I exclusively use CCI 450 primers and see no reason to go beyond. That said, below is some useful information to make your own determination. CCI 400 -thin .020" cup, not recommended for AR15 type use by CCI. CCI BR4 - match primer with a thicker .025" cup. CCI 450 - same thicker .025" cup as the BR4 and #41. CCI #41 - .025" thick cup. COMMERCIAL version of the fully-qualified DOD primer for use in U.S. military ammo. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup than with other CCI SR primers. Same primer mix as CCI 450. CCI states: "The CCI 400 primer does have a thinner cup bottom than CCI 450, #41 or BR4 primers. The appropriate primer for an AR15 platform is the CCI #41 primer, which helps to prevent slamfires. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup." [as per: Linda Olin - CCI/Speer Technical Services]. NOTE : According to Speer/CCI Technical Services - Both the CCI 550 Small Pistol Magnum and CCI 400 Small Rifle primers are identical in size. Both primers use the same cup metal and share the same cup thickness. Both primers use the same primer compound formula and same amount of primer compound. They can be used interchangeably. Cases that utilize Small Rifle Primers and operate at moderate pressures(40,000 psi) should use CCI 400, Federal 200, Rem 6 1/2, or Win WSR. Cases that utilize Small Rifle Primers and operate at higher pressures (55,000 psi) should use CCI 450, CCI BR4, Fed 205 and Rem 7 1/2 etc. Posted Via AR15.Com Mobile Yes, I only buy SRP's for 9mm, 40S&W, 38spl, .223/300 and I have never had a single problem. |
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Posted: 11/22/2014 1:38:33 PM EDT
[#36]
Quote HistoryQuoted:
The Rifle cup should be taller than the pistol. Quote HistoryQuoted:
Quoted:
So could one use the CCI 400 to load 9mm? Quoted:
No. I exclusively use CCI 450 primers and see no reason to go beyond. That said, below is some useful information to make your own determination. CCI 400 -thin .020" cup, not recommended for AR15 type use by CCI. CCI BR4 - match primer with a thicker .025" cup. CCI 450 - same thicker .025" cup as the BR4 and #41. CCI #41 - .025" thick cup. COMMERCIAL version of the fully-qualified DOD primer for use in U.S. military ammo. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup than with other CCI SR primers. Same primer mix as CCI 450. CCI states: "The CCI 400 primer does have a thinner cup bottom than CCI 450, #41 or BR4 primers. The appropriate primer for an AR15 platform is the CCI #41 primer, which helps to prevent slamfires. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup." [as per: Linda Olin - CCI/Speer Technical Services]. NOTE : According to Speer/CCI Technical Services - Both the CCI 550 Small Pistol Magnum and CCI 400 Small Rifle primers are identical in size. Both primers use the same cup metal and share the same cup thickness. Both primers use the same primer compound formula and same amount of primer compound. They can be used interchangeably. Cases that utilize Small Rifle Primers and operate at moderate pressures(40,000 psi) should use CCI 400, Federal 200, Rem 6 1/2, or Win WSR. Cases that utilize Small Rifle Primers and operate at higher pressures (55,000 psi) should use CCI 450, CCI BR4, Fed 205 and Rem 7 1/2 etc. Posted Via AR15.Com Mobile The Rifle cup should be taller than the pistol. Only in large, not in small. |
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Posted: 11/22/2014 10:49:17 PM EDT
[#37]
I came home with a box of Remington 6-1/2 primers once without knowing they are not good for AR so I took it back in exchange for CCI BR4. At that time I didn't have my 9mm but at least now I know I can use sml rifle primer in place of sml pistol primer if I have to.
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Posted: 11/25/2014 8:34:30 PM EDT
[#38]
JME. YMMV.
I have exclusively used 400s thousands of times with no ill effects in my ARs. Barrels were PSA CHF (FN) 16"mid, FNMI 20" rifle, and KAC 16" int. All 5.56 chambers. Powder was CFE223 slightly above book max, worked up safely obviously. IMO, in order for a slam-fire to occur multiple layers of fail must happen. ie: CCI400+ firing pin protuberance out of spec, etc. IME, using CCI400 in a perfect functioning AR should not ,alone, cause an issue (slam-fire) so I use them with confidence. Hope this helps. Again, JME/YMMV. Load safe! |
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