Severed all four tendons in my right rotator when 50. Had to be reattached differently, but works OK today at 76. Then I had a torn retina and the doctor told me all I had to do if it totally severed was get to him within 24 hours and he could reattach it. Scared me because I was booked for a Cape Buffalo hunt in Africa in a couple of months. So muzzlebrake was put on my 375 H&H and Global Rescue was paid up to haul me out if need be. Everything went well. Got my buff and had no retina issues. I kept the muzzle brake on.
I did settle for the 375 H&H being my dangerous game rifle because I cannot handle anything heavier recoiling any more. I have tried 416 Rigby and Remington, and 458 Lott. Just more than I can handle. Besides I can get two shots off with the 375 H&H before I can even get back on target with the heavier recoilers.
Best of luck if you hunt a brownie with that 6.5! Having been within 30 feet of them, I believe a bigger bullet is better. That said, if you only chase whitetails I don't think you can beat a 6.5 CM.