You could never prove affect of normal case to case weight differences.
This, because a dominant affect (by far) does not come from already expanded brass against chamber. It comes from the energies needed to expand each case to chamber.
Chamber clearances and brass hardness.
Initial volume (h20 cap) affects load density, which is more than nothing, but relatively nothing w/resp to consistent clearances and pressure peak energies employed to remove those clearances.
Deep body dip annealing (process anneal), and dead consistent case dimensions would directly take you where you might think matched H20 capacities would (but doesn't).
This, because a dominant affect (by far) does not come from already expanded brass against chamber. It comes from the energies needed to expand each case to chamber.
Chamber clearances and brass hardness.
Initial volume (h20 cap) affects load density, which is more than nothing, but relatively nothing w/resp to consistent clearances and pressure peak energies employed to remove those clearances.
Deep body dip annealing (process anneal), and dead consistent case dimensions would directly take you where you might think matched H20 capacities would (but doesn't).
