Sorry but I think that the cylinders are different. Its 45 Auto Rim that is designed to interchange with the 45 acp with the moon clips. I doubt you would have clearance to close the cylinder. But you could probably have an additional cylinder made so that you could do it, thats how the Blackhawks work.
Dang it I made a MAJOR mistake and shot my mouth off without thinking. I didn't see "LONG" in the post and my brain said acp and rim.
I am TRULY SORRY Mr Thunderbolt. A stupid advisement can get someone hurt and I just Did that. And I KNOW better even. I make no escuses sir. I was running through the board and saw you just posted and hoped to answer you quickly before you signed off. I didn't think. I posted in haste.
Hello, my name is Brizzo and I am a Moron. Please help me through the 12 steps.
The ruger blackhawk chambered for .45 long colt can be had with another cylinder that chambers .45 acp. Ran into a guy selling one at the gun show a few months back he was asking $450 for it. If you can't find a ruger with an the extra cylinder no worries, you can order one from ruger direct or numerich has them.