I will agree with ar10ar15man, I don't throw any shots out unless it's a rare called flyer, where I screw up on my hold or trigger pull. If you have a shot that felt good but fell out of the otherwise decent group, you need to find out why, especially when hunting. Flyers without cause are simply unacceptable and can usually be identified by extremes in either velocity, ES or SD. Find and eliminate the cause (if possible) or move on to a different load. Personally, the bane of my shooting is usually the 3 & 2 groups. Trying to pin down the causes can drive a guy to strong drink!
Cheers,
crkckr