This is also my understanding. I've read that full load 10mm is ballistically comparable to stout .44 Rem Mag loads.
You are probably thinking 357. 10mm is not close to 44mag:
Buffalo Bore
-HEAVY 10MM OUTDOORSMAN - 220 gr. Hard Cast - FN 1,200 fps/ME 703 ft. lbs.
-Heavy .44 Magnum Ammo - 270 gr. J.F.N. @ 1,450 fps/M.E. 1,260 ft lbs
-Heavy .44 Magnum +P+ Ammo - 340 gr. Hard Cast, L.F.N. - G.C. @ 1,425 fps/M.E. 1,533 ft lbs
Standard 44 mag is around 900 to 1000 ft lbs of muzzle energy
Standard 10mm is typically 500 to 600 ft lbs
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