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I've had a few .45 lever gunz and every one of them has had absolutely horrendous blow-back. The small rim and ancient dimensional specifications for the .45 LC result in less than satisfactory operation in lever gunz. I've gotten rid of all mine.
The .44 Magnum, on the other hand, is a modern cartridge that came to market after SAMMI started standardizing cartridges and chambers, and the rim is full sized. The .44 works great in lever gunz and is one of the most versatile cartridges available to the hand loader. I've never made a round -- high or low intensity -- that wasn't accurate. Great cartridge. Great in lever gunz.
You'll not be happy for long with a .45 Colt's Long lever rifle.
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Really?
Were you shooting light blackpowder loads?
Other than that, there should be no issues. A modern .45 Colt case is not so different than a modern .44 Mag case. It is not the rim that seals the chamber, it is the case walls. A standard load in a .45 Colt is fine in a levergun, and the only people I have heard that had any issue were CAS shooters using light BP loads; they generally say they prefer .44-40 for that due to the thin case that seals the chamber better with the lower pressures.
People hear about things, like people saying they have blowby on a .45 Colt levergun, and assume they have the same issue, without really understanding it.
Also, one of the issues with the .44 mag in leverguns is that a number have been made over the years that are difficult too find accurate loads for, due to wrong twist rates or bore dimensions, so you have to be sure what you are getting. When I hear someone say they have trouble with their Browning 1892 or Marlin 1894 shooting accurately, I immediately expect them to say that it is chambered in .44 Mag, and most of the time they do.