Have you tried strapping the rifle to something like a lead sled and see where the groups are?
As a hobbyist gunsmith I often find the problem lies behind the sights. The person firing the rifle. (I count myself in that group at times). It could be that you are jerking the trigger (unconsciously) or poor eye alignment with the sights. By strapping the rifle to a sled you take the user out of the equation and can evaluate where the problem lies. If the rifle is consistently grouping then the rifle is fine and you need to work on sight alignment. If you find out the sights line up too then you need to take a hard look at yourself and see what you are doing wrong. I have to admit, we all do it. Sometimes it is just the need of going back to basics.
I hope that helps.
PS -- If you need a bore sight. I have one you can borrow.
As a hobbyist gunsmith I often find the problem lies behind the sights. The person firing the rifle. (I count myself in that group at times). It could be that you are jerking the trigger (unconsciously) or poor eye alignment with the sights. By strapping the rifle to a sled you take the user out of the equation and can evaluate where the problem lies. If the rifle is consistently grouping then the rifle is fine and you need to work on sight alignment. If you find out the sights line up too then you need to take a hard look at yourself and see what you are doing wrong. I have to admit, we all do it. Sometimes it is just the need of going back to basics.
I hope that helps.
PS -- If you need a bore sight. I have one you can borrow.