I am going to try my Sidekick with PRB next time I go out with 2F Black. I will try what I have on hand first, which is .490 ball and .15 patch and start at 50 grains and go all the way to 100 grains. For hunting, I would think anything 70 grains or over, if it shoots pretty accurately will be fine for whitetails. I am hoping it patters nicely with 80-90 grain, if so, I will use the PRB over the Maxiball. I will not try to shoot the PRB over 50 yards, and will keep my shots at deer at or under said range also. Jack.