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I agree that the loading process is probably the usual cause of loose arbors.
I have an 1860 Army Colt Signature Series that I've shot for over 15 years.
For a short while I was using .457 RB and after a bit of fouling built up in the chamber they were way too tight. I was loading on the frame with the loading lever. The arbor became quite loose on that gun. I didn't do anythinng else to the gun that should have made it loose. Reasonable powder charges (19gr), and never used it as a club!
I have switched to more appropriate fitting RB's on all my others and have not had a problem.
I've heard it said that the reproductions use softer metal than the originals to reduce wear on the tooling. I have two original 1849 Pocket Models that have no loose arbor problems, and an original London Navy that is just slightly loose. Guess I can't fault that after more than 150 years.
Chowmi
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