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The "Marlin Jam" as it is affectionately known is caused by an inherent design/manufacturing flaw of the Marlin lever. The lever has a snail shaped cam surface that goes around the pivot screw. Every time the lever is cycled the carrier bounces on the forward edge of the cam. The forward most edge of this cam is left sharp at the factory (the flaw).
After many thousands of cycles, the sharp edge cuts into the carrier enough so that the timing is slightly changed. At first, you will feel a slight "hitch" when cycling, then the timing will get worse; the carrier nose gets lower in relation to the magazine tube opening so that two shells are allowed to exit the magazine. The first shell comes in on top of the carrier as normal, and the second shell slips past the carrier nose and gets trapped between the top of the carrier and the magazine opening in the frame.
Marlin calls this "letting in two" because rather than letting in one cartridge at a time, the carrier allows two to slip by.
I would find an older out of current production Rossi 92 in 454 Casull and call it a day.
Otherwise I think the new Buffalo Horn Armory in .50 S&W would be about ideal.
I have a Rossie R92 (bought an older one to clarify) and actually I love the darn thing. In .45LC I put decently hot hand loads in it and it is very accurate for me (considering its a lever gun with open sights).
Heavy .45 Colt +P - 325 gr. L.B.T.-L.F.N.(1,325fps/M.E.1,267 ft.lbs.) - 50 Round Box
These Heavy .45 Colt +P loads are safe in all LARGE FRAME Ruger revolvers.
(includes Blackhawk, Super Blackhawk, all pre-2005 Vaquero, Bisley, Redhawk)
These Heavy .45 Colt +P loads are NOT intended for the New Model Vaquero (small frame).
These loads are also safe in all modern Model 1892 leverguns
as well as all Winchester & Marlin 1894's
Google "Dreaded Marlin Jam fix" There is a site that with pics, tells you how to fix this. I picked up an 1894 in .357 and did the mod to eliminat the problem. It is simple to remove the lever screw and gentley round over the edge of the cam that is too sharp and cuts a groove in the shell carrier that is the problem. If you already have the jam problem, order a new shell carrier and round over the cam as shown in the pics.