7.62x39 case capacities
- Thread starter 303hunter
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From what I know, most cases will be right around 35-36 grains of liquid. I do know from watching precision reloaders measure case volume that certain case manufacturers are more consistent than others but having said that, even the best brass manufacturers will vary within lots and some will vary wildly. I know that doesn't help much but I thought I would just through it out there. Good luck!
OP
Most of my brass is Fiocchi. Bought a bunch of loaded ammo from Academy last December when they were $8.99/20, so that’s mostly what I’ve loaded. I do have a few samples of other brands picked up at the range. Guess I’ll fill some with water and weigh them.
Most of the folks I’ve seen measure case volume with liquid usually use a high alcohol content rubbing alcohol. I can’t remember exactly why but I think it has to do with trapped air bubbles or something like that. I’m sure someone reading this thread might know why.
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OP
I’ve never tried to measure case capacity before, but it’ll be a new reloading experience. I mostly load 6.8 SPC, and the case capacities are easy to find on 6.8 forum. 7.62x39 is a different story though.
OP
Brass with more powder capacity equals less pressure. Loading longer than factory equals less pressure. Higher capacity cases last longer than lower capacity cases with the same loads.
That may be true, but why not load to a certain velocity so your rounds are more consistent? If you are worried more about case life than about consistent performance, load them all lower. If it is just blasting ammo, performance matters very little, so a load just strong enough to work the action is all you need.
Anytime you change components, the process of developing a charge should start over if you want consistency. You might need different powder charges for different brands of cases to get the same velocity in all your rounds.
Anytime you change components, the process of developing a charge should start over if you want consistency. You might need different powder charges for different brands of cases to get the same velocity in all your rounds.
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