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Posted: 11/12/2008 12:22:35 AM EDT
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Thought you might find this interesting if you've never encountered it before.
Factory surplus Lake City .30 Carbine fired in a USGI M1 Carbine (unknown manufacturer). Primer is very flat and pierced. If your loads look like this, you may want to back off a little. 
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Back on USENET, some joker was recommending a CASE FULL of W231 under a 110 grain FMJ as a "good load" for .30 carbine. That looks like it.
M18 high pressure test ammo has a pressure of 47,500 PSI. But it also has a black case. I am SURE that 231 load exceeds HPT pressure. DO NOT USE IT!!! |
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Quoted: So that's what it looks like. What happens when your pierce the primer? Gas leak out of bolt/receiver? Or is it if nothing happened? gas leaks are bad, think what happens eventually to gun barrels you get throat erosion eventualy, and think of the top strap flame cutting on revolvers. That bad stuff will happen to your bolt face if you get enough pierced primers |
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I have had 3 or 4 pierced primers the past year in my 223 bolt guns. My friend's chamber reamer is for 223 with 55 gn bullets and it is a bit tricky to develop a load in a faster twist barrel such as 1:8 or 9. The heavier bullets from Sierra do like a little jump to the rifling; too little jump and a little too much charge gives you a pierced primer.
As stated in the earlier post it is not good for the bolt face or firing pin tip. When a primer pierces the gun's report is a little different (milder) and when you open the bolt it will be lightly smoking for a few seconds. I can't see any damage to either gun. My pre 64 model 70 in 223 with a 1:8 twist Douglas had one and my Savage model 16 stainless 223 with 1:9 factory barrel (set back) had around three. I had the Savage first and learned on it. I knew what to do to the loads when it happened on the model 70. |
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Quoted:
I have had 3 or 4 pierced primers the past year in my 223 bolt guns. My friend's chamber reamer is for 223 with 55 gn bullets and it is a bit tricky to develop a load in a faster twist barrel such as 1:8 or 9. The heavier bullets from Sierra do like a little jump to the rifling; too little jump and a little too much charge gives you a pierced primer. As stated in the earlier post it is not good for the bolt face or firing pin tip. When a primer pierces the gun's report is a little different (milder) and when you open the bolt it will be lightly smoking for a few seconds. I can't see any damage to either gun. My pre 64 model 70 in 223 with a 1:8 twist Douglas had one and my Savage model 16 stainless 223 with 1:9 factory barrel (set back) had around three. I had the Savage first and learned on it. I knew what to do to the loads when it happened on the model 70. So do you blame this on the powder charge, or the primer? No flame, I am curious. |
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I blame it on an early pressure spike. If the bullet had been a little further off of the lands and/or less powder it would not have happened.
Quoted:
Quoted:
I have had 3 or 4 pierced primers the past year in my 223 bolt guns. My friend's chamber reamer is for 223 with 55 gn bullets and it is a bit tricky to develop a load in a faster twist barrel such as 1:8 or 9. The heavier bullets from Sierra do like a little jump to the rifling; too little jump and a little too much charge gives you a pierced primer. As stated in the earlier post it is not good for the bolt face or firing pin tip. When a primer pierces the gun's report is a little different (milder) and when you open the bolt it will be lightly smoking for a few seconds. I can't see any damage to either gun. My pre 64 model 70 in 223 with a 1:8 twist Douglas had one and my Savage model 16 stainless 223 with 1:9 factory barrel (set back) had around three. I had the Savage first and learned on it. I knew what to do to the loads when it happened on the model 70. So do you blame this on the powder charge, or the primer? No flame, I am curious. |
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