Thread: Case capacity question.

Yes, differences in case volume will lead to differences in pressure. How much depends on the size of the cases, the amount of difference between them, the type and the amount of powder, and the chamber it's being fired in. Even knowing all the variables, you'd still need specialised pressure tracing equpiment to give you an exact answer on a case by case basis.

Just pick one headstamp to work with (for consistency's sake) then start low and work up. Your rifle won't care whether the type you used was thick, heavy, low volume stuff, so long as you developed the load accordingly, following safe practice.