Cabela's rifle questions

[coredneck]

So I have this cabelas .54 rifle (left handed) and we are headed out to the local gunsmith tomorrow, I am still wondering if he can bore it out to say a 20 gauge (.615) or 28 (.550) or someplace in between to use for turkeys and small game. I also am interested in a barrel swap but to new to this to know what to look at or what things are supposed to be called when looking things up. Being made by investarms I would think they may have made a single shotgun or smoothbore I could swap? Any help as finding anything blackpowder out here in the boonies is rare

 

[longcruise]

That barrel could be taken out to a smooth bore in the neighborhood of 58 caliber as long as nothing has been drilled too deep.

 

[bubba.50]

Don’t know if they ever offered it in left hand but at one time investarms Hawkens could be had in 20 gauge. The barrels were marked .20 cal.

 

[JBeardNC]

Numrich Gun parts used to stock barrels for investarms, but appear to be out of stock. I actually purchased a left hand barrel from them years ago.