A couple of years ago I had a very accurate Winchester Classic Stainless rechambered from .375 H&H to .375 Ackley Improved. It is still very accurate, keeping all of my selected loads @3/4" at 100 yards. I was surprised though that I didn't get the velocity increase I thought I would. In order to maintain accuracy, I only picked up around 75 fps. Has anyone else done this conversion, and if so, what did you pick up in velocity?