Weighing Cases & Powder

Has anyone ever weighed cases and taken ten cases that weighed the same,and then filled them with water to check the internal volume of the case, both in weight and the amount of water it takes to fill it.Just a rookie thought
Rudy Manuel
 
rudedog said:
Has anyone ever weighed cases and taken ten cases that weighed the same,and then filled them with water to check the internal volume of the case, both in weight and the amount of water it takes to fill it.Just a rookie thought
Rudy Manuel
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Yes, I have done exactly that several years ago and was surprised to find there was no correlation between case weight and water volume. I know it doesn't make sense, but that is what I found and the reason I quit weight sorting cases.

Gene Beggs
 
Cases

Gene Beggs said:
Yes, I have done exactly that several years ago and was surprised to find there was no correlation between case weight and water volume. I know it doesn't make sense, but that is what I found and the reason I quit weight sorting cases.

Gene Beggs
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I have always felt that cases are just a container to hold the things that matter most, Period. They only need to be sized properly so that the bolt operates easily and I like the idea of limiting their growth but I have never seen that they were the cause of bad shots.
 
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Big Bores & Low Velocity ES

I had a Highwall .45-70 once that yielded incredibly low velocity ES. This was shooting 500 gr cast bullets with smokeless powder. I have read that the black powder shooters get low single digit spreads consistently with these big bore guns. Low ES is definitely easier to acheive in cartridges that are not overbore. For short range BR it's just not as important as the longer range games. I guess it could give one extra confidence if his loads exibit low velocity ES.
 
Don, in answer to your question,

"Along this line of thought, do the .22 Beggs/Russian velocity variations exceed both the 6PPC and 30PPC?"

I can't speak for the 30ppc because I have never owned one, but the 6mm Beggs compared to the 6ppc averages about half the extreme spreads in muzzle velocity. I attribute this to the smaller case capacity relative to bore size.

It would take much more experimentation to prove it, but I have stumbled on to something I believe is significant as it relates to extreme spreads and that is flash hole diameter. The flash holes in the Lapua 220 Russian case, out of the box are drilled .059. Since this is too small to accept most decapping pins, I have always drilled them out to .063 with a Sinclair tool while the case is in the lathe during neck turning. In some cases, I have even drilled them out as big as .073. I now believe that is a mistake and that we should leave the flash holes exactly as they are; .059. With my 6mm Beggs NT, I usually see extreme spreads of around 20 to 30 fps with excellent accuracy. I have tried many different powders but I always come back to good ol' H4198.

Gene Beggs
 
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