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Falcon195
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Posted: 1/28/2012 7:15:23 PM
[Last Edit: 1/28/2012 7:18:50 PM by Falcon195]
CCI 450 vs CCI 41 primers.
How do these compare, are they interchangeable without reworking loads?
LC 5.56 brass, LC 55 gr FMJBT bullets, CCI 450 primers, 24.8gr's H335 at OAL 2.225"
AeroE
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Posted: 1/28/2012 7:47:32 PM
It's probably okay, but that's a bad practice.

There's no need to do a long string of new loads, drop the charge 5%, load two or three cartridges with half grain increments, and judge from those results whether the substitution is okay.

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ReefRaider
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Posted: 1/28/2012 7:49:23 PM
[Last Edit: 1/28/2012 7:50:55 PM by ReefRaider]
I will say this , the CCI #41 primers are magnum primers too. Your load is well below max also.
"There is a fine line between having balls and being a dumb ass" GB

"Machine Gunners - Accuracy By Volume"

InfiniteGrim
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Posted: 1/28/2012 7:53:43 PM
[Last Edit: 1/28/2012 7:54:57 PM by InfiniteGrim]
Just buy CCI41's.

In my experience they are reliable, offer repeatable performance, and are the most accurate primers I have used (shooting groups wise)


Originally Posted By ReefRaider:
I will say this , the CCI #41 primers are magnum primers too. Your load is well below max also.


I wouldnt say "well below" Its close to the advertised max in many manuals. I get around 2900fps in a 16" which is pretty fast.
rg1
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Posted: 1/28/2012 9:34:52 PM
All info I've read says data is interchangeable between CCI 450 and CCI 41 primers. Info says the priming mix in both are the same as well as primer cup thickness. The difference between the two is that CCI 41's have a little more distance between the anvil and the cup which is intended to reduce the risk of a slam fire in semi autos with floating firing pins such as the AR 15.
ReefRaider
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Posted: 1/28/2012 10:22:37 PM
Originally Posted By InfiniteGrim:
Just buy CCI41's.

In my experience they are reliable, offer repeatable performance, and are the most accurate primers I have used (shooting groups wise)


Originally Posted By ReefRaider:
I will say this , the CCI #41 primers are magnum primers too. Your load is well below max also.


I wouldnt say "well below" Its close to the advertised max in many manuals. I get around 2900fps in a 16" which is pretty fast.



From were I'm standing 2.2 grns is well below max. for 5.56 loads YMMV.
"There is a fine line between having balls and being a dumb ass" GB

"Machine Gunners - Accuracy By Volume"

scoutfsu99
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Posted: 1/28/2012 10:45:40 PM
Isn't 26gns the stated max?

Here's a question I have. Since LC crimps their primers, why don't we? I understand the basics (I think). Crimping is to make it(primer) more stable for burst/auto fire? Since we don't do that (generally), we don't crimp the primers? What am I missing.

Obviously I'm new to this. I try to read whatever I can and pay attention to these threads but I haven't gotten a satisfying answer on this.
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EWP
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Posted: 1/29/2012 12:43:07 AM
The crimp is to keep the primer from falling out and jamming the action, when you have someone shooting back at you this cant happen but for the civilian shooter it's best to not have the primers crimped, that way if the load is to hot the primer can come out and make the shooter aware of it.
GHPorter
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Posted: 1/29/2012 9:33:14 AM
Originally Posted By EWP:
The crimp is to keep the primer from falling out and jamming the action, when you have someone shooting back at you this cant happen but for the civilian shooter it's best to not have the primers crimped, that way if the load is to hot the primer can come out and make the shooter aware of it.


Specifically, crimped primers prevent jams in automatic fire. This is a MIL-Standard that is applied to all GI cartridge ammo (not shot shells), even GI .38Spl. But as EWP points out, up I cannot use some primer indications of pressure with crimped-in primers because the crimp hides some indications and changes others. Further, I think that if there were a real use for handloaders to crimp their primers, there would be a dozen products on the market to do this, and we'd see "oh no not this crap again" arguments over which one was best.
"--you can't conquer a free man; the most you can do is kill him."
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ScEd1
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Posted: 1/29/2012 11:18:07 AM
The crimp is to help keep from popping a primer under adverse conditions, like firing a M16 when the barrel and action is still full of water. And no, it wont cycle the action full of water either. Not sure how well the new rose-pedal crimp is for this.