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Two things are going to establish your upper limit in velocity with an M1A/M14 (or any semi-auto for that matter), chamber pressure and port pressure.

You can get really high muzzle velocities with slower burning propellants, but the port pressure becomes unacceptably high. Faster propellants give lower port pressures for the same velocities but have higher chamber pressures.

You should stick to propellants in the 4895/4064 range of burn speeds for heavier projectiles, a little bit faster for lighter projectiles.

M118 Long Rang Special Ball (175 gr SMK) is loaded to about 2600 to 2620 fps at the muzzle, 2575 +/- 30 fps at 78 feet.
 
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