44 mag muzzleloader combo rifle?

[Cpt Caveman]

Does anyone beside Rossi make a rifle that can be had in 44 mag(or 357) and a 50 caliber muzzleloader barrel on the same receiver? I know thompson center makes 'em but I can't put that much in at this time.
My google fu is failing me.

 

[IndyGunworks]

Thompson is the way to go... green mountain barrel, fantastic trigger, and TOP quality.

 

[jrose361]

You maybe able to find a CVA, older model with that combo