Posted: 5/24/2009 12:55:42 PM EDT
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OK, So I'm reloading for my Nagant revolver. 4.4 grs of Herco, 95gr bullet. All goes well at the range but I noticed something strange when cleaning my brass. All of the fired cases had dents in them starting right about where the base of the bullet would be. Some had one, some two, some 4 spaced around the case. Almost looked like it had been fired in a fluted chamber, but my chambers look fine. Just looked like the brass was dented in very slightly at these locations.
Any idea what this means? |
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Quoted:
Bump because someone has to know? Is it possible that this is an underpressure situation and a slight vacuum is forming before the bullet leaves the barrel? Is this AFTER you re-sized them? I have had the same thing happen with 5.56 brass, and it was a piece of shit in the sizing die. |
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Are you using Nagant cases? With the "gas seal" length? They can trap air due to this unique feature, causing dents. This is a definite with below-neck seating.The pressure seals the chamber at the base, then the neck seals and the trapped air has to go somewhere. |
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Quoted:
Not sure in your case. But in bottle-necked rifle cartridges, shoulder dents can be caused by either oil in the chamber, or a powder that is "too slow" for the application. Try a faster powder, like WW-231 or Bullseye. I actually went to the slower powder because I was getting overpressure issues with bullseye/clays. |
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Quoted:
Are you using Nagant cases? With the "gas seal" length? They can trap air due to this unique feature, causing dents. This is a definite with below-neck seating.The pressure seals the chamber at the base, then the neck seals and the trapped air has to go somewhere. This seams most likely, the cases are actually just below factory length to allow easier loading but still index into the forcing cone at lockup. I guess this means I got my case length right. |
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Quoted:
Quoted:
Not sure in your case. But in bottle-necked rifle cartridges, shoulder dents can be caused by either oil in the chamber, or a powder that is "too slow" for the application. Try a faster powder, like WW-231 or Bullseye. I actually went to the slower powder because I was getting overpressure issues with bullseye/clays. Then reduce the amount of fast powder. 
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Quoted:
Quoted:
Quoted:
Not sure in your case. But in bottle-necked rifle cartridges, shoulder dents can be caused by either oil in the chamber, or a powder that is "too slow" for the application. Try a faster powder, like WW-231 or Bullseye. I actually went to the slower powder because I was getting overpressure issues with bullseye/clays. Then reduce the amount of fast powder.
Wanted more velocity without the higher pressure. |