Thanks Griz. I knew that the .45-75 was a bottleneck, and I kinda figured that a rebarrel would be in order. I guess the concern is, are the magazine and receiver the same size for both calibers? Woud any changes need to be made in the action, like changing the cartridge lifter? Chaparral shows the NWMP in .45-75, but no other calibers. Does Uberti plan to make a carbine, and if so, will it be in .45-60?