Originally Posted by Mikecr
-Do you have any basis for actual measurement of capacity being inferior to implication of it with brass weight?
-Do you realize that brass changes in capacity from new, to fire formed, to sized one way or another, all with zero change in brass weight?
-Do you understand that initial confinement has a significant affect on powder burn rate, peak pressures, and resultant MV?
-Have you measured H20 capacity of your cases, correlated each with their weight, Sized some of the cases and re-measured H20 capacities, again correlating to weight, and fired across an accurate chronograph to see results?
MikeCR obviously you have by that statement.
Pick a cartridge you have some good data on show the variation in capacity from initial fireform to sized with your honed body die as that is your preferred method that alludes to show perpetual case life, absolutely no growth or variation of the case until the final firing before the bolt click etc etc.
All measurements on the same cases for at least 5 firings of each case?
what is that variation in grains of H2o for each of the 5 firings?
What is the variation in actual MV (not some computer WAG) with that variation for each time?
What chrono are you measuring it on and screen spacing?
I know everyone would be very interested. I know I have done small scale tests before and do not see the wild variations alleged. In almost every case the extra weight is in the base and virtual identical volumes. I am conducting a test right now on 100 pieces of brass and detailed measurements and data to include chrono and various sizing and sorting methods. So far not seeing it, but early stages so it might be there.
Really do want to see some real data that supports those positions. Might see something I need to include in my tests.