I've been shooting the Hornady 350 gr. FP in mine, on top of 46.5 gr. H4198, lit with Rem. 9 1/2 primers. It shoots very well with that load. I tried up to 48 gr. of that powder, but it started to open up. The 46.5 gr. load shoots the best in my gun. I have never chronographed it, and I really need to do that. Maybe early this coming spring when the temps are still down, but the darned snow is gone.......