I tried the 30 cal 200 gr accubonds this past year on my first elk trip. I was shooting them out of a 30-378 at 3400fps. I got my elk and also recovered all 3 bullets I shot it with. Two were front shoulder hits that probally retained half their weight and the other was a gut shot that...
I had several different brakes on some different 300 rum and the holland definetly tamed recoil the best. I could spot all shots beyond 500 yrds. I am getting a 338 rum built now and am trying the muscle brake heard good things about it. Good luck.
I have one in a 30-378, 30'' hart in sendero. I put a remington recoil lug on because it used to slide back and forth in the stock. The factory lug is in the stock and the stock cracked at the top of the grip area. Like the action though and it shoots well.