DL, I've had the 7x57Ackley for my main hunting rifle for over 25years now. I don't have a lot of loading data as I lucked upon my load shortly after building my rifle. About 4% over 7x57 loads is about as good a place as any to start and stop. I shoot 56.5gr of RL19 in mine and have since day one. I get a little over 3050fps w/Norma brass and 140gr Ballistic tip. I wouLd start w/IMR4350, H4831, and RL19&22. Start around 53gr and work up. You should start seeing signs of pressure around 56,57gr. powdr
