To check the volume without measuring tools fill it full of alcohol and pour it into a commercial case. Alcohol doesn't have the surface tension water does and will lay flat.
I'd put a spent primer in for the test. If all you have is a live primer I'd fire it afterwards rather than risk depriming a live primer. I guess you could also jam a toothpick in the flash hole as long as the same amount protrudes into the case. Both need to be sized or both fired from the same chamber.smoffett said:I like that idea, but I think the alcohol would flow out through the flash hole unless I plug it up. Maybe I could seat a primer in there for that? Would that be safe? Could I deprime it afterwards without the primer blowing up?PhillipM said:To check the volume without measuring tools fill it full of alcohol and pour it into a commercial case. Alcohol doesn't have the surface tension water does and will lay flat.
see post #6This is done by seating a bullet without a primer or powder, weighing it with a piece of scotch tape across the base, then filling the case with water via a hypodermic syringe to the top of the flash hole and replacing the tape then weighing it again. The difference is water capacity. Without this figure, you are going at it blind. You will be amazed at the variations between cases. And, since we have no way of measuring pressures, proceed slowly.