I'm interested in a slide action rifle. I've seen some offered in 45 long colt. However, none of my data books list that round, only listing a 45 colt. Is there such a beast and if so what distinguishes it from the 45 colt? I've got 3 Speer, 3 hornady, 2 Hodgdon, 1 WW, and one IMR manuals...