It sounds as though you have things calmed down for now. Congrats. BUT, I noticed you mentioned an inspection of the muzzle crown. I would suggest a re-crowning of the muzzle. Visual inspections don't always reveal flaws.
I bought a Winchester 94 Timber Carbine in 444 Marlin that simply refused to hit a washing machine at 50 yds. I tried everything, nothing worked...until I re-crowned the muzzle. Now it shoots nice tight little groups. I am the 3rd owner, and I guarantee the previous owners gave up on it.
