So, does that sound like a fair definition?
Honestly, NO. If it was 100%, you would never miss. I know accomplished hunters who've whiffed from inside 10yds. Now....that being said.....did they "miss" their intended spot? Probably not. The spot just moved

If that's the caveat....I'll buy in.
I defineit as beingthe distance I have complete confidence I can kill the deer I'm shooting at from.
I am not sure it can be defined, there are too many variables involved. I feel that this will change with every opportunity that is presented in the woods.
That was well stated.