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Hi Galen and welcome. Yes Sir it is. The .44 Mag., .440 Cor-Bon, .429 and .50 AE all have the same cartridge-case-head dimensions, which allows them to use the same bolt. However, the .44 Mag. cartridge itself requires its own magazine because of the case diameter. The .440 Cor-Bon and the .50 AE share the same parent case, which makes the .50 AE magazine compatible with both cartridges. Cheers and stay safe!