I just bought some bulk Berry's bullets for 357 mag, 158 grain plated. I'm using starline brass and CCI 500 small pistol primers. I have some Alliant powerpro 300MP powder I'd like to use. Alliant has some data on their site. I believe it is 18.6 grains for 158 hollow points reaching a velocity in the 1600s. I read on berry's bullet site not to exceed 1250 fps. I do not have a chronograph and these will be plinking rounds. I'm looking for some experience and safe loading data. I've never loaded plated or cast bullets before. Thanks.