Not now it seems. I am fairly sure now I have an idea of what happened here. Someone had a 44 "hotshot" barrel that didn't do what they wanted so it was rebored to accept the .410 shell. This is why it is only labeled 44 Mag, there are a lot of rechambered barrels out there that weren't marked as such. So, now the chamber is too big for the 44 Mag and the bore is too small for the 45LC. What you have there is a fine .410 shotgun, that's all. And that's not a bad thing 'cause the 45/410 barrels don't shoot slugs worth a hoot anyway.