The 450 Bushmaster does very much the same thing as the 454 in a rifle. It is a slightly more versatile cartridge IMO as well since it can be chambered in ARs, Bolt Actions, Single Shots, and in full custom lever actions like this one on GB right now.
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The 450 BM is a lower pressure cartridge as well but can be hot loaded for the stronger actions like all the bolt actions it is chambered in as well as the Ruger No 1. I really should have gotten one of the stainless Ruger No 1 450 BMs when they were available for $899 from CDNN. The 1:10 twist rate sort of confused me though.
The Browning 1885 454 Casull I am getting is a high wall. It is also a full 28" rifle with octagon barrel and "traditional" semi buckhorn sights. My 270 1885 is octagon barrel but no sights.
Browning/Winchester/Miroku also made a "Traditional Hunter" model with a shorter barrel chambered in 45-70, 38-55, and possibly also 40-65....maybe a few others. They also had traditional sights and octagon barrel. Pretty cool run of guns really.