I think you'll find the increase in velocity gained by seating bullets further out is less than expected. Once again, Barsness shows that the increase in velocity is 1/4 the increase in powder. A 10% increase in powder charge only gets a 2.5% increase in velocity. He specifically uses the 257 Robt. as his example. Many guns magazines were modified to hold 3" OAL instead of factory 2.8" and velocity gains were negligible. If your getting close to 25-06 velocities with similar bullets, you may have dangerous pressure. A 120 grain Partition from a 257 going 2800 or so is a deadly round on thin skinned game.

__________________
beaver