Re: Cartridge Chamberings?
Depends. Now, you can get one of them NEFs in 308, and then later get a 12 gauge barrel to put on it. No problem with that. That receiver built to take 50,000 psi pressures will love that 14,000 psi shotgun. Some folks say you can get one made for a shotgun and put a rifle barrel on it. That's asking for a hospital stay, in my opinion.
Now, if you took that same 308 rifle barrel, and reamed it out to 30/06 (assuming there is enough metal in the "chamber section" of the barrel to ream that far), then you should be all right, as 308 and 30/06 are both the same diameter case and approximately the same pressure load. If you tried to ream it to 300 Weatherby Magnum, on the other hand, you're asking for trouble. Same if you tried to ream a 45/70 to 458 Win Mag. Same size bullet, but you are probably gonna lose an eye when that thing blows up.