A Magnum often has similar caliber as pistol, but has longer shell for bigger boom and punch
357 Magnum = 9mm
40 S&W = 10 mm Auto
50 S&W = 50 AE
If you want something akin to a Desert Eagle, the the I.S. equivalent would be around .72-.75 at best. .80 would be considered monstrous (like 565 Casull often featured as BFG in anime)
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