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Posted: 10/19/2020 9:53:11 PM EDT
[#1]
Too tight of a crimp can cause problems like that. Obvi too light a crimp ditto. Those chamber check gauges are usually pretty generous too.
You should just be ironing out the bell, not really crimping. Reaming should be the final choice and I doubt that’s it. Wait, it eats factory, no reaming. Post a pic of your reload. |
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Posted: 10/19/2020 10:10:22 PM EDT
[#2]
Make a dummy round.
Seat the bullet deeper by a few thousands at a time till it chambers properly. Then start your work up. Chances are your bullet is just too far out and it is engaging the lands. |
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Posted: 10/19/2020 10:13:50 PM EDT
[#3]
Since you asked for opinions...
It sounds premature to consider a chamber modification. Chamber mods are in the realm of graduate level shooting, not for the normal rig or how to solve what may turn out to be a temporary sizing, seating, or bullet problem. I would advise you to exhaust those three topics on your own as best you can, then seek outside help if you can't figure that out on your own, long before you should custom chamber your bbl. There are some good reasons to taylor a chamber to a specific situation, but debugging doesn't make me think jumping to cutting the bbl is wise. I would check your reloads against factory ammo that works in several dimensions and go from there. Is your case sized properly? Are you seating properly? (Flare, straight, taper crimp, roll crimp, bulged neck, etc., all part of seating. Seating depth of your bullet?) Is the bullet profile one you have worked with before? Does it need a different depth or profile? I would run these issues all down before I would ever consider a chamber modification. |
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Posted: 10/19/2020 10:18:59 PM EDT
[#4]
I have a similar issue with my LWD barrel in my g17. My remedy was sizing with a Lee die on a single stage press.
My cases passed a Dillon case gage and Lyman gage but but failed the barrel. I also had issues with an SP101 that was fixed the same way. |
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Posted: 10/19/2020 10:22:49 PM EDT
[#5]
I have had a similar problem in the past. A Lee U die (undersized die) allowed for minimal crimp with no bullet setback and 100% pass rate with a case gauge.
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Posted: 10/19/2020 10:28:45 PM EDT
[#6]
Quote HistoryQuoted: Too tight of a crimp can cause problems like that. Obvi too light a crimp ditto. Those chamber check gauges are usually pretty generous too. You should just be ironing out the bell, not really crimping. Reaming should be the final choice and I doubt that's it. Wait, it eats factory, no reaming. Post a pic of your reload. |
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Posted: 10/19/2020 10:29:57 PM EDT
[#7]
Quote HistoryQuoted: Make a dummy round. Seat the bullet deeper by a few thousands at a time till it chambers properly. Then start your work up. Chances are your bullet is just too far out and it is engaging the lands. |
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Posted: 10/19/2020 10:33:24 PM EDT
[#8]
Coated bullets have to be seated deeper than cast/plated/FMJ.
Was .003 for me. |
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Posted: 10/19/2020 10:42:30 PM EDT
[#9]
L->R
Federal 150gr Syntech, (me) Black Bullet 147gr FN*, CCI Blazer Brass 115gr, (me) Blue Bullet 147gr RN** * Both measured 1.050" OAL ** Both measured 1.150" OAL  |
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Posted: 10/19/2020 10:45:25 PM EDT
[#10]
Doesn't matter what other loads measure.
If you have rifiling engraved on a bullet or hard extraction, shorten OAL. BTDT |
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Posted: 10/19/2020 10:49:38 PM EDT
[#11]
Quote HistoryQuoted: L->R Federal 150gr Syntech, (me) Black Bullet 147gr FN*, CCI Blazer Brass 115gr, (me) Blue Bullet 147gr RN** * Both measured 1.050" OAL ** Both measured 1.150" OAL https://www.AR15.Com/media/mediaFiles/15341/20201019_213522-1644662.jpg You can almost visually see the ogive of your bullets being higher than the other 2. Recommended OAL is recommended and may not work in all firearms. I still stand by my recommendation to shorten your OAL incrementally till you get proper plunk test results. |
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Posted: 10/19/2020 10:57:47 PM EDT
[#12]
Quote HistoryQuoted: You can almost visually see the ogive of your bullets being higher than the other 2. Recommended OAL is recommended and may not work in all firearms. I still stand by my recommendation to shorten your OAL incrementally till you get proper plunk test results. I will make a dummy round that fits the barrel and do some sample firing in both firearms. |
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Posted: 10/19/2020 11:33:37 PM EDT
[#13]
The Ogives on your 2 bullets look longer/further out than the 2 others. The longer ogive will hit the rifling which then prevents the round from fully seating. And this is a variable from one gun to another.
I would do as suggested and load some dummy rounds seating deeper in about .010 increments and try them. |
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Posted: 10/20/2020 12:01:54 AM EDT
[#14]
Quote HistoryQuoted: I got zero problemo with seating deeper and using the barrel as the case gauge. But that leaves an unanswered question in my mind that these loads drop freely in a case gauge and function/fire with no problem in other 9mm handguns. I will make a dummy round that fits the barrel and do some sample firing in both firearms. Quote HistoryQuoted: Quoted: You can almost visually see the ogive of your bullets being higher than the other 2. Recommended OAL is recommended and may not work in all firearms. I still stand by my recommendation to shorten your OAL incrementally till you get proper plunk test results. I will make a dummy round that fits the barrel and do some sample firing in both firearms. You raise a fair point. All I can tell you is that sometimes the reamer is designed per specs right up to the end of the case, but then those subtle differences at the rifling interface are what gets us, and case gages don't represent those partially cut lands. Try the seating depth and lets see how far they have to go before they plunk in the bbl. The 147 looks like it will take a lot before it will match, but the FN one should be pretty close now. Good Luck. |
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Posted: 10/20/2020 12:58:11 AM EDT
[#15]
Some chambers have short throats, seems like that is the case with your colt. You could use a finish reamer to clean up the chamber and throat and maybe be able to use the ammo that works in your other guns in your colt, or just load all your 9mm to fit in the shortest throat / tightest chamber you have which means it will work in the colt and anything else you have.
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Posted: 10/20/2020 9:52:48 AM EDT
[#16]
Those case gauges are not an exact replica of your chamber. Close, but never identical.
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Posted: 10/20/2020 11:04:52 AM EDT
[#17]
So I dropped from 1.150" OAL to 1.080" before I could get it to drop fully in the chamber.
That seems like quite a bit of difference (-.07"). Does this pass the smell test? |
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Posted: 10/20/2020 11:50:31 AM EDT
[#18]
Have you tried any in another firearm? Otherwise, yes. Looking at those bullets they will need a deeper seat.
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Posted: 10/20/2020 12:01:35 PM EDT
[#19]
Yes, the one's loaded to 1.150" OAL function/fire fine in my Walther Q5 Match & Walther PPQ M2 4".
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Posted: 10/20/2020 12:35:51 PM EDT
[#20]
Quote HistoryQuoted: Those case gauges are not an exact replica of your chamber. Close, but never identical. This is best observation The KerPlunk Test is the telling tale. |
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Posted: 10/20/2020 12:53:23 PM EDT
[#21]
Quote HistoryQuoted: So I dropped from 1.150" OAL to 1.080" before I could get it to drop fully in the chamber. That seems like quite a bit of difference (-.07"). Does this pass the smell test? Seat to 1.080 and work you load back up. Then you will know for sure. I did the same thing when loading for a CZ 85 (tight short chamber). Had to decrease 0AL .004, so I worked up again and ended up with the same powder charge. I load 9mm to 1.040 and it chambers in all of my 9mm's. CZ 85, M&P. LC9, and 5 AR9's. |
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Posted: 10/20/2020 2:06:28 PM EDT
[#22]
Quote HistoryQuoted: Since you asked for opinions... It sounds premature to consider a chamber modification. Chamber mods are in the realm of graduate level shooting, not for the normal rig or how to solve what may turn out to be a temporary sizing, seating, or bullet problem. I would advise you to exhaust those three topics on your own as best you can, then seek outside help if you can't figure that out on your own, long before you should custom chamber your bbl. There are some good reasons to taylor a chamber to a specific situation, but debugging doesn't make me think jumping to cutting the bbl is wise. I would check your reloads against factory ammo that works in several dimensions and go from there. Is your case sized properly? Are you seating properly? (Flare, straight, taper crimp, roll crimp, bulged neck, etc., all part of seating. Seating depth of your bullet?) Is the bullet profile one you have worked with before? Does it need a different depth or profile? I would run these issues all down before I would ever consider a chamber modification. ^^^This! |
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Posted: 10/20/2020 5:37:58 PM EDT
[#23]
Quote HistoryQuoted: Too tight of a crimp can cause problems like that. Obvi too light a crimp ditto. Those chamber check gauges are usually pretty generous too. You should just be ironing out the bell, not really crimping. Reaming should be the final choice and I doubt that's it. Wait, it eats factory, no reaming. Post a pic of your reload. I trust Sheridan for rifle cases/rounds. I don't think they make pistol gauges. You can take a black magic marker, cover the bullet, and then try to chamber it. This will tell you your point of interference. Dykem works too. |
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Posted: 10/20/2020 5:41:32 PM EDT
[#24]
Thanks all, I think I got it sorted out. I'll report back after my next range trip. Might be a while as I start on call support tomorrow for a week.
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Posted: 10/20/2020 5:44:57 PM EDT
[#25]
Quote HistoryQuoted: I trust Sheridan for rifle cases/rounds. I don't think they make pistol gauges. Sure they do... Right here. |
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Posted: 10/20/2020 6:31:36 PM EDT
[#26]
Quote HistoryQuoted: Make a dummy round. Seat the bullet deeper by a few thousands at a time till it chambers properly. Then start your work up. Chances are your bullet is just too far out and it is engaging the lands. |
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Posted: 10/20/2020 8:05:53 PM EDT
[#27]
Quote HistoryQuoted: Doesn't matter what other loads measure. If you have rifiling engraved on a bullet or hard extraction, shorten OAL. BTDT THIS. The ogive is wider on the blue bullets. They hit the rifling before the more cone shaped other bullets do. Just make them shorter so they don't engage the rifling. The brass sizing has nothing to do with this imo. EDIT. I see it worked out. FYI the case gauge just checks the brass, not engagement of the bullet with rifling which varies from gun to gun type and manufacturer. |
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Posted: 10/20/2020 8:10:49 PM EDT
[#28]
You can determine EXACTLY why your ammo won't fit by using a magic marker and following the guide at the link below;
The Plunk Test |
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Posted: 10/21/2020 3:35:33 PM EDT
[#29]
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Posted: 10/25/2020 3:58:21 PM EDT
[#30]
Well those rounds functioned super fine. Now load up about 500 of those.
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Posted: 10/28/2020 12:35:57 AM EDT
[#31]
have the throat reamed and then you could load to the length you want .
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