Something I never tried doing at 100 yds. I realize your question is hypothetical but I know I am plenty good enough at 50 and probably 75 to easily kill a deer. But for one thing, I would never shoot at an animal at 100 yds without some sort of rest. To me it is just unethical and there is a good chance of wounding the animal. At 100 yds, you should have ample time to find some sort of rest. Even if its our knee or sitting, or whatever. But if you are realistic about this, the rifle doesn't know how far away the target is. So if you do your part, you should not have any trouble hitting what you're aiming at.