How fast have you safely driven the 220 SMK out of your 300 RUM? I was out today toying with the 220's and accuracy was very promising. Was using 90.0 of H50BMG @ an average of 2942 with a 9 FPS extreeme spread. There were no pressure signs whatsover, in fact the primer looked like it was mild. Before I decide to add anymore powder, I was wondering about what is the max velocity for this bullet in this case. Shooting 11.25x and 28" Thanks!