The .44 Russian and .45 Auto Rim are nearly the same length - 'cute' little big bore cartridges. It would seem a likely candidate for a near maximum pressure load with the Speer thin wall (#4427?) 200gr Gold Dot JHP in .44 Special. Breaking 800 fps, the incident velocity in gelatin for frontal area doubling from a 3" barrel, would be easy (The .44 Special Blazers, and my favorite, the GA Arms load with that same bullet in a new Starline brass case, do this easily from a 2.5" barrel - such as my 296.), making it an effective bg stopper - in a compact bullet. Yeah - hold your breath for renewed interest in the .44 Russian, the original mass produced metal centerfired cartridge. It's interesting how a 240 gr LSWC over 3.5gr Titegroup in a .44 Russian case can make 692 fps from a 3" 696 - the personification of a 'poof' load. But - it easily makes 'major' power factor!
Of course, the .45 Colt small Taurus - or a .45 ACP one, adapted to .45 Auto Rims - could carry a bigger and more massive Gold Dot - the also thin walled Speer #4484 250gr GDJHP for .45 Colt. I keep them loaded with some 255gr LSWCs, both 840+ fps from my 4" 625MG - solid for thick skin; HPs for thin. Choices!
Stainz