Folks, I may be wrong ( won't be the first time ) but this is on a rifle forum, and Wala42 was asking about using 45 ACP in his "45 Colt " saddle gun ( not revolver ), being that the question is on the rifle forum, and the way the question is worded, leads me to believe he is asking is .45 ACP and .45 Colt are interchangeable in his rifle ( which I'm assuming is a lever action. Whats all this have to do with moon clips?