You can still get the Legacy Puma's in .454. The 1892 is the only appropriately sized action strong enough to contain the pressure but even so, I really don't think they should be run over 50-55,000psi. All the other actions tried, the Marlin 1894 and 336, Winchester 94 and 94 Big Bore could not withstand the pressure. The `86 is strong enough but if you're packin' a rifle that big and heavy, it may as well be a .45/70, which leaves the .454 choking on its dust.