.475 Wildey Magnum is bigger and a lot more powerful than a .44 Magnum.
Its bullet is .475" diameter vs. .429" diameter for the .44 Magnum.
Their case capacities are almost identical, but the .475 has slightly more (38 grains of water vs. 37.9).
The .475's pressure limit is quite a bit higher at 50,000 CUP vs. 40,000 CUP (the old SAAMI .44 Magnum pressure limit was a little higher at 43,500 CUP, but still well below the .475's).
A typical older .44 Magnum load could push a 240-grain bullet at about 1,450 FPS from a ~6" barrel (1,120 ft-lbs of muzzle energy), while .475 Wildey Magnum can push a 250-grain bullet to 1,850 FPS (1,900 ft-lbs of muzzle energy).
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