Have fun with your new project. It sounds like lots of fun.
I also have an opinion about:
Foreign military chambers VS American die makers
I’m in agreement with Fiver.
.
anyway one thing your gonna have to watch for is die selection.
some of the older rifles and LEE dies do not work well together.
I have seen the 7.5 and the 7.65 argie both be ones where the LEE would work in one rifle but not the other two rifles sitting next to it.
I load for two Arisakas, both made at the same arsenal, but years apart. The fired brass from these two rifles is very similar, not a perfect match, but very similar. The angle of the shoulders on fire formed cases from both rifles looks nothing like brass converted using a RCBS FL sizing die, or Norma and Hornady factory brass for that matter. A fired case’s shoulder looks much more life the shoulder of an Ackley Impoved case.
Headspace is another issue. with the bolt disassembled (these are cock on close rifles) I can put four layers of blue masking tape on a factory Norma or a freshly converted case (RCBS die). Three layers no smash, four layers light smash, measuring the smashed tape(super precise method
) I get .014” headspace. So the dies are making the cases too short at the shoulder.
So my new method of forming and sizing involves a .012” shim when setting up my dies. I have to live with the shoulder angle, and shortened brass life that comes with overworking the brass in the shoulders.
I’m not gonna talk about the “Bulge”, just above the web.
Have fun,
Josh