When you get into 180 grains or heavier- bear and moose loads, yeah, there's a risk of bending the op rod. Not so much from a single round, and yes, I've carried my M1 with a 180 Silvertip as the first round up in the chamber in bear country- but from the practice rounds needed to sight the rifle in for those loads. As little as two boxes will do it.
Personally, I'm more interested in going the other way: Remington's 125-grain low recoil load is a dandy, and cycles the actions of the three Garands I've tried 'em in just fine. There's lower recoil, of course, but also less flash at night, and lessened penetration for those concerned about what FMJ ball can do in urban areas. Along the same line, Remington's 55-grain saboted Accellerator functions just fine in my M1, if you've ever wanted to try a 4000 fps round out of an M1, out to 100 yards or so.
How does that do for groups? I tried them in my Rem bolt rifle years ago and they were only so-so at 100 yd targets.
The 125 load is an interesting idea.