Case capacity in different brands of brass

[Brians356]

Your measurements using water are probably accurate due to the density of water as opposed to powder.

It's a fair point, but I'm not sure about it. Both media do require care and technique. I use water myself, but others here tout a ball powder like H380. If the powder is dropped into the two cases repeating the same technique (not unlike charging cases from a powder thrower), and several measurements for each case are averaged out, I see no reason why a relative comparison cannot be as accurate as water. For determining the absolute capacity of a particular case, the more meaningful figure is capacity H20, since nearly all reference material uses H20 as the standard for comparison, and for ballistics calculations.
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[olddav]

It's a fair point, but I'm not sure about it. Both media do require care and technique. I use water myself, but others here tout a ball powder like H380. If the powder is dropped into the two cases repeating the same technique (not unlike charging cases from a powder thrower), and several measurements for each case are averaged out, I see no reason why a relative comparison cannot be as accurate as water. For determining the absolute capacity of a particular case, the more meaningful figure is capacity H20, since nearly all reference material uses H20 as the standard for comparison, and for ballistics calculations.
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I agree. I was referring to the difference in weight variations and in no way intended to question the method suggested by others. More than one way to skin a cat although I’m not sure why you would skin one.

 

[Brians356]

I agree. I was referring to the difference in weight variations and in no way intended to question the method suggested by others. More than one way to skin a cat although I’m not sure why you would skin one.

It wouldn't take long to set up a thrower to slightly overfill one case, then drop charges into the case ten times, wiping the excess powder level with the case mouth each time with a straightedge, and weigh each charge, averaging all ten. Then switch to the other brand and compare averages. It would take maybe half an hour, whereas measuring water capacity is a much slower process for me, anyway.
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