I was going to reply to this early on, but got busy.
I have used the OTM in both 30 cal and 33 cal, they both shoot great on TARGETS, but both did strange things on game once beyond about 600 and I stopped using them for LR game hunting.
Now, I see very often that people recommend them and I truly wonder if they have shot many game with them. I had 3 instances at close range where both the 30 cal and 33 cal failed to open and travel in straight lines and not tumble in the animal, all 3 failed to exit. Then at long range had them fail to open at all and do very little damage, the animals all died, but again, the bullets tumble in the game, this is not because the twist rates were not correct, they were faster than recommended.
Anyway, take from this what you will.
Cheers.