A bad crown, IMHO, wouldn't cause those poor groups. You can re-crown it yourself....Brownells sells a brass crown tool and the grit and it's very low tech. Your electric drill does the work. Call Brownells and ask for a techie and he will help you out. 1/8 inch seems hugely excessive. Normally just cutting down to the Lands and grooves is all you need. If the barrel needs 1/8 inch, then the barrel is probably shot anyway. Brownells 40/44 will touch up the end of the barrel. Good luck and regards, Rick.