Any modern rifle that is also chambered in .44 Mag will handle "Ruger" .45 Colt loads. These loads are in the 25k-30k PSI range.
DO NOT use Freedom Arms or custom 5-shot revolver loads, those pressures can be 50kPSI and higher.
First though, use the right bullet. For "Ruger" loads you won't want to use bullets meant for "cowboy" loads. Missouri Bullet Copany has a 255gr LSWC and a 300gr TCFP @ 18 Briness Harndess. A RNFP bullet may feed better than a SWC, but the TCFP will probably feed fine. Beartooth Bullets also has a good selection.
Typical .45 colt or .45 ACP lead bullets will be too soft for "Ruger" loads.
The 250 gr XTP is another great bullet to use.