I have a new 2022 Winchester Miroku 94 Sporter in 38-55. I have slugged the barrel and found a .375” bore diameter. I plan on using a Lee 379-250-RF and .376 sizer. I will PC the boolits. I also have some Starline brass.
I have read that the RCBS Cowboy Dies are for ‘period’ firearms, thus their expander is designed for larger bores; .379 and up.
I have also read where Lee dies are for the .375 - .377 diameters.
I read, too, that Lyman 3 die sets come with a M die expander.
What have you guys had good luck using?
Thanks again!