Ise H4831SC in three of my 300 Wby match rifles, they all chronograph over 3400fps with a Hornady 178gr A-Max. Did a rifle for a friend useing my reamer and he uses the same load but he never Chronographed it, hes useing my drop chart and its dead on out to 800 yards. H4831SC is one of my favorite powders in large capacity shells. Used it some in a 243 with 105gr bullet and the velocity was good but accuracy was not as good as RL19
