so if half inch squares...all your 2nd group of six are in roughly an inch.....thats a dead plover/bunny/magpie at that distance....out to 400,its going to open out to 4" so still very good chance of making pink mist.....
im going to take a wild guess here from what you have just posted...the standing group,you have firm grip of forend...and the prone,different grip....maybe even the "hug yourself" off hand on toe of stock?????
even if not...your loading on bipod would be diferent..I know myself if standing shooting over something I tend to lean forward to put weight on arms.... it MIGHT explain diferent point of impact.
and again if out to 400 on varmits....2" high at hundy MAY be easier .
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