I have one of the group buy 6 cavity molds that is essentially the Lee 175gr RN .324 but with a flat nose. So this weekend I tried it in my 98k that I'm thinking of shooting at Perry in a bit.
Here's what I tried:
30 gr surplus 4895- no filler- nothing great
30 gr of the same- PSB filler- no real change
32 gr- no filler- awful
32 gr PSB filler- a little better but still awful
27 gr IMR 4198- ok, 5" group
18 gr surplus 4759 (my 'go to' load for my M48A)- eh, 4"
21 gr Alliant 2400- happiness. 3 shots touching, the other 2 within 1 1/2 inches.
All reasonable powder charges, proven in other guns... you never know what will work.
I was using old fashioned 50/50 lube FWIW.
I might play with the 2400 load a bit yet to see if there is a sweeter spot at 20, 22, whatever, but otherwise I will test it out to 200 and take it to Perry.
Should that fail, I'll be shooting 1938 dated German surplus. Great stuff, I just hate to burn through it.