Rate of fire is adjustable in an M2. For M2HB, 450-575 rpm, aircraft model (lightweight air-cooled barrel) 750-850 rpm, up to 1,200 rpm for electric feed boosted aircraft guns.
The ammo is not designated M2, that is 30-06 ammo. The M2 fires M33 ball, M17 tracer, M8 armor-piercing, M20 armor-piercing incendiary. There is a new cartridge designated M933 SLAP-T explosive round designed for use against hard targets.
Projectile weight for different uses is different.
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