I have the Ruger Alaskan .454 Casull / .45 long colt and its vicious! Ask Joe
I've finally worked out some of the issues it has in .454. There is a learning curve to this version & its certainly not for most shooters. The others don't share these issues. The .44 Alaskan is very nice to shoot.
I bought a 16" Stainless Rossi R92 lever action in .454/.45lc to match it. Simple but wonderful rifle in the hands. Unfortunately it looks like the feeding ramp angle is off slightly as the tip of the rounds would hit the top and not slide into the loading chamber. I'm waiting to get it back from Rossi.
I have fired the .357 version in a 20" and will likely order a 16" .357 sometime if I find a decent deal. I've never fired a Marlin.