Optimized Caliber

[Tony Williams]

Major drawback to both is the non-availability of platforms optimized for intermediate-length, intermediate-diameter cartridges, which means it'd be necessary to use the bulkier, heavier weapons developed for 7.62x51 (such as the AR-10, Mk17, etc).

True, development and initial use would be in AR-10 sized actions (although these could maybe be lightened a bit). But if such a round were ever adopted by the military, intermediate sized actions would appear...