I finally took the 45-70 BC shooting today. Chased the bullet holes around a bit, but it finally settled down. Shot a three shot group at 100 yards that measured 1-1/4", but 6" low. Adjusted the sights, and got a three shot group, centered, that measured 1-1/2".
Shooting this thing is pretty awesome. Love the recoil. I was shooting Winchester 300 gr factory ammo.
Had an issue with light primer strikes on three cartridges. Had to re-fire them, and they went off. Then shot 5 more rounds with no issues. Doesn't seem like there is anything wrong with the action, because the last 5 shots were fine. Could have been an ammo issue, or not pulling the trigger all the way.