RE: minimum accuracy requirements
People seem to be mixing rifle accuracy with shooting accuracy. Weatherby MK V' s, for example, used to come with a proof target proving 1 1/2" group size off the bench with Wby. ammo. That was considered to be good rifle accuracy. If you don' t handload, try different ammo to see which load gives you the best rifle accuracy, hopefully inside 1 1/2" @ 100 yds.
Once you know what the rifle / load combo will do, work on your shooting accuracy to learn what distances you can accurately shoot from different positions. Then you will have a much better idea of when not to shoot to avoid cripples and misses.