I think AWA puts out a repro of the Colt lightning rifle in .357mag. I do know that there is a .45colt at least.

There is also a new Taurus "Thunderbolt" rifle coming out for 2005, I think right now it is just in .45colt, but it's being marketed to the cowboy action shooting crowd, which almost always demands as many .357mag/.38spcl guns as it does .45colt guns. This is an absolutley beautiful rifle, IMHO, and pumping a pistol carbine is "Lightning" fast!!!