Per HSMs FAQ:
45 Colt ammunition OTHER than Cowboy Action ammunition is for use ONLY in the OLD STYLE LARGE FRAME Ruger Blackhawk (post 1973, not the pre 1973 3-screw) including the ORIGINAL Ruger Vaquero and Ruger Bisley version of the Blackhawk, the Thompson/Center Contender, the Magnum Research BFR, or any firearm chambered in 454 Casull or 460 S&W including the Taurus Raging Judge.
It is NOT for the NEW STYLE SMALL FRAME Ruger Blackhawk and its variants like the NEW Vaquero or the New Flat-top Blackhawks.
It is NOT suitable for the Colt Single Action Army, Colt Cowboy, Colt Anaconda or Ruger Redhawk, Taurus Judge, any Smith and Wesson revolvers including the Governor or any vintage or replica firearms.
We have no information on any rifles that can safely shoot this ammunition at this time.
https://hsmammunition.com/faqs/
