You can shoot a pretty big group and still be in the killing zone on a deer. It comes down to what you feel is good enough for you, and human for the animal. Lots of folks can shoot sub 1" groups at 100 yards off the bench, but try it off hand. It changes real fast. I feel best around 1" at 100 yards, and then practice alot a differnt ranges off hand. Sitting, standing, laying down, etc. You will know when you are confident on what you are doing.
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