Actually, with the 454 Casull there is only one choice. I love my little 200-yard big game killing powerhouse!
With the 44 Mag in a new rifle, only one choice, the Rossi R92. Owning both the Marlin and Rossi and being a cast bullet shooter my choice would be the Rossi. It is super nice to own a rifle cut to the SAAMI chamber spec! My Marlin 1894P remains one of my favorites, but to get it there made me a bit crazy.
The Rio Grande was my first dip into the Rossi products. After shooting my RG4570 for six months, I sold both my 1895G and 1895MR. It comes down to the same thing mentioned on the 44 Mag. It is nice to find a 45-70 that needs a .458 bullet and doesn't have a weird off spec throat that must be filled with lead. I really struggled with the RG at first because I couldn't quite figure out what it needed as I was trying to apply what I know about Marlins to it. I thought it must be really undercut until I compared the SAAMI spec to the chamber cast, it was exact. So, with that it only needs a tangent R1 ogive bullet for the caliber to fit. End of throat fitting story. I have shot bullets from 300 to 525-grains and all shoot great.
I will always be a Marlin guy but working with the Rossi's for two years now and being a cast bullet guy, I look back and look at how hard I worked to be a Marlin guy. It would have been easy to throw in the towel.
The good thing about the new Marlins are that they are being cut on chamber spec now but that is throwing old Marlin guys a bit. The bad thing is that Remington thought that they could throw everything into a CNC, spit out the rifle, and assemble it like they do their bolt guns. They didn't bet on the levergun needing a little precision slop to get the cartridge out of the tube, onto the carrier, and into the chamber.
There is a young man hunting on my place with a Remlin 336Y that nobody has been able to make right including myself and the factory. Youth rifles have a mission for the manufacturer, to ingrain product loyalty. Remlin has lost out with this rifle; this young fellow will never own another old or new.