The rounds development an incorporation into an M-4 framework was “cobbled together” by people who needed a bit more punch than that offered by the 5.56mm round. It single stacks into an existing magazine.
Are you .458 (11.63×40 mm) shooters bothered by the smaller magazine capacity or is the trade off worth it?
The .458 SOCOM can be loaded subsonic – thus they can be silenced without a big sacrifice.
The ballistics of a 45/70 Government in a semi auto – AR platform (upper).
Do you like the .458 SOCOM better than the .450 Bushmaster?