[archy]

I can't figure the velocity of a .30 cal projectile with a 50BMG powder load behind it! Would have to be a stout bullet to hold together.

As always, barrel length makes a difference, but circa 4000 FPS is quite possible. But the bullet doesn't need to be that strongly constructed, since the rifling contacts the plastic *sabot* guide and pressure seal instead of having the bullet jacket scored by the rifling.

More on the M903 .50 SLAP ammo here, and also on the SLAP-tracer round.

[Blue Collar Christian]

My concern was over the RPMs the projectile might be subjected to, so rifling twist rate would be the factor at 4000fps. Alot of bullets for varmint rounds are tough enough to withstand the revolutions of fast rifling, I was just guessing that the projectile would be travelling at well over the 4k fps this round achieves.

Still, KOOOOL!