Savage muzzleloader Barrel

[cshields]

While tightening my breech plug this evening my barrel broke loose from the action.I was just holding my stock while tightening as I didn't have a vise to hold the barrel.What would have caused this to happen?Thanks

[rpcw]

The barrel nut wasn’t tightened enough.

You need to reset headspace and tighten the barrel nut.