Before you go any further check everything is tight, ie scope, mounts, and bases,most of them rounds are up and to the right, thats if thats the way around the target was,are you left or right handed,? are you sure you were comfortable on your rest,you wernt feeling as thought you were reaching up with your back to keep the gun level,I dont know if its a wood stock or not but fold a peice of paper and slide it between the barrel and forstock,it should move unobstructed down to the breech almost,you say they are home loads did you set the bullet depth with a AOL gauge,have you tried factory amm