As previously stated: Those pistol caliber rifles are designed for average Joe to walk into a gun store and secure what ammo is on hand. You’ll be fine with pistol load data.
I dont have a 454, but I do sometimes shoot it in my 15inch 460 S&W T/C Encore pistol barrel. That’s as close as I can get to rifle barrel length 454. I have no problem with factory ammo. I haven’t reloaded 454 yet as I am still unloading the 454 factory ammo for the brass.
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