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Posted: 8/31/2004 10:07:28 PM EDT
i noticed that some of my cases have this slight swelling or bulging near the rim. its around 3/16" of an inch from base of shell. The rifle functions perfectly, some are more pronounced than other shells of the same make, some will have very minimal or no deformities. Headspace had been checked already, and is OK. My barrel is an OLYMPIC arms 16" heavy barrel.
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Posted: 9/1/2004 1:10:25 AM EDT
[#1]
I have a barrel that did that with with one type of ammunition. I sent the cases and some of the same lot to the manyfactuer of the ammo. They tested it and said the pressure were ok when fired in a barrel with a correct chamber. The best I could figure on mine (if it really was not the ammo like they said) was the throat is too shallow. This could cause elevated pressures with the certain shapes of bullets or depths of bullet seatings. The ammo was UMC and remington said it tested fine no problem with it.
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Posted: 9/1/2004 4:08:32 AM EDT
[#2]
Sounds like a chamber dimension problem.
Denny |
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Posted: 9/1/2004 4:39:25 AM EDT
[#3]
That is usually caused by too great a radius at the mouth of the chamber.
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Posted: 9/1/2004 1:43:34 PM EDT
[#4]
On mine more of the bulge was at the portion past the rim that is really not supported by the chamber. Most of the barrels I have have an angle cut at part of the mouth of the chamber. Mine only did it with one of the ammos I was using.
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Posted: 9/1/2004 10:06:39 PM EDT
[#5]
Could be a brand with thinner case walls, or a shorter web, bullet seated longer, or case longer. |
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Posted: 9/2/2004 4:16:58 AM EDT
[#6]
excessive headspace is a possability.
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Posted: 9/2/2004 11:03:05 PM EDT
[#7]
Excess headspace creates lower chamber pressure. The case will stretch but not bulge. If the case is thin (reloaded multiple times) the web may actually fail. The same short lenth of cartridge is unsupported regardless of the headspace.
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Posted: 9/3/2004 5:46:40 AM EDT
[#8]
what ammo are you using ??
i have had several incidents with S&B ammo in new & nearly new rifles. |
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