I use a Lyman 375449 GC .375 bullet, sized to 0.377" and lubed with Tamarack (NRA 50-50) lube. The lead is fairly hard, at about Bhn 18. The powder is 32.0gr of Reloader 7 and gives 1,794fps with good accuracy. That is case-full to the base of the seated bullet without compression. I once used a drop tube to get 34.0gr of RL-7 in and gained about 80fps, but it was not worth the extra work.
I also use 12.5gr to 13.0gr of Red Dot with a Lee plain-base cast for plinking loads. Haven't bothered to chrono them.
