I use 79 gr of H 4831 under a 190 Berger. I have took it up to 83 gr. and accuracy was not as good. It is a stock 26" accumark barrel. Velocity is just over 3000. Not a screamer but I use this rifle with a XVIII LR and the BC reticle. The reticle lines come in at 200, 300, 450 and 550. That is as far as I will shoot this rifle. Hope this helps!