.44 Special because that’s what most Smith & Wesson Triple Lock revolvers are chambered in.
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I have a 10mm Gp100 and it makes a fine revolver cartridge, comparable to the 357 in power. Also have a 29 and have to say the 44 Mag is likely my second favorite revolver cartridge after the 357
Favorite for using the revolver, that will be the 500 S&W magnum. Just defies Earth's curvature
And then the 460 came along.........just saying.