Re: Military surplus powder questions.
Welcome to The Firearms Forum, Sparkle
I do not load any of the three calibers you mentioned, but I did look through a couple of my reloading manuals. Neither WC857 nor IMR7383 are listed for those three calibers in any bullet weight. I think I would stay away from some unknown military powder without it being listed in at least one manual, no matter how cheap it might be.
NRA Endowment Member
Retired US Army
Retired Postal Worker