Definitely slug your bore, some m39 were .308 bore, others were .312. I’ve just been messing with an m38 that I put together for my son. It has a larger bore. I’ve been using reduced loads of H4895 and have had decent results. .308 125gr sst are shooting about 3” groups at 50yds. .310 123gr gold dots shoot 12” group @50 ( I think the bullet is too short to stabilize properly). The 150gr Speer and hornady soft points will do an inch @50. There is definitely a huge difference between the different diameter bullets.


JTD