11-09-2011, 10:56 PM
I would run at least a 130gr for a machinegun load, and with a half-bullpup design like the M60 or full bullpup, barrel length would not be limited. Even with a conventional design, the 19-20" barrels used on the Mk48 are still maneuverable, while a 20" 7.62 NATO MAG58 is not.
You will need higher pressures to get any 6.86 projectiles to keep up with 7.62 NATO. 6.5mm is the caliber node in short actions when it comes to best trajectory, best wind drift, and lower pressures, with substantial bullet weights.
You will need higher pressures to get any 6.86 projectiles to keep up with 7.62 NATO. 6.5mm is the caliber node in short actions when it comes to best trajectory, best wind drift, and lower pressures, with substantial bullet weights.