New Cartridge Developments and Implications for Dismounted Infantry Soldiers

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Copper fouling also becomes significant, which is one of the reasons you see more and more banded bullets.

This is a work-around that may be viable in military bullets when using modern fabrication machinery.

Trouble is, banded bullets are unlikely to be used by the Army. The jacketed, exposed penetrator (M855A1) design was chosen because it could be made on the existing machinery at Lake City. Any new caliber would certainly face the same requirement.

Making a more precise statement -- you can still get the long bullet and without getting a long bearing surface.

Yeah, but in addition to the manufacturing issue, there's also the question of whether or not a matching tracer would be feasible.