CraigC
Sixgun Nut
I don't know how we'd ever determine which is more popular. Although the .45Colt has the distinction of having the same cartridge chambered in both Colt SAA and similar guns on up to Ruger, FA's and BFR's. So yeah, you're gonna see more .45Colt's than .44Mag's. In the .44 persuasion, you're really talking about two cartridges, the .44Spl in Colt's and other middleweight platforms and the .44Mag in heavier guns. I'm sure that's why the OP mentioned both. Were I to guess, I'd say that in Colt-sized/strength guns, the .45 is head and shoulders more popular. In stronger guns, probably the .44Mag, due in no small part that the .45 really requires handloading to realize its potential and if Facebook has taught me one thing, most people are still shooting factory loads. They're really ballistic twins, regardless of platform, the .44's do it with less powder and more pressure, while the .45 does it with less pressure and more powder. In the Colt sized guns, the .44Spl is really a better choice and for several reasons. Thicker chamber walls, less chamber slop, more consistent throats and it does the same thing with less powder. The .45 is a relic of the blackpowder era and that cavernous case is a lot of wasted space at 14,000psi. None of that seems to matter to the market though, for every .44Spl I'm sure there's 100 .45's and 1000 .357's. Cheap ammo seems to matter more than any other factor. So I'm not sure how much weight we should assign to popularity. I mean, look at pop music.