I don't beleive that anylever action rifles were chambered in .45 colt back in the old west. The rim on the original ,45 colt was too small for the rifles to proberly eject them. I have also heard that the .45 colt was proprietary to Colt at that time, so other gun manufactures could not use it.
It was not until recent times that the .45 colt was given a wider rim.
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