I'd like to know what the mass of that slug is, turning at what, 7,600rpm? Then figure what the potential "energy at the muzzle" would be at the crank radius for that projectile..
No idea how far the weight actually was from the crank centerline, but 4" from centerline would give a circumference of about 25" - or 25" travelled per revolution. At 7600rpm that's 126.7 revs per second, 25*126.7 = 3183.5 in/s, or 265.3 ft/s, or about 180mph. I definitely wouldn't want to get hit with it, but not necessarily a gunshot level of velocity.
