10" is too far left to be the load or shooter. That is a bad barrel, either runout or bent.
If I have put down my money for a barrel, I would not want to bend it to make it shoot straight. To my brain that introduces stresses that would tend to make groups sizes larger. I know that gunsmiths did it in the old day, but if it can be replaced, I would want it replaced.
I am glad Jim has jumped in and offered to fix it.
I have had two bad barrels, and they are a nightmare to try to get to shoot.
Best wishes, Marc