[grobdriver]

The case of a sabot round (the sabot) falls clear after exiting the muzzle.
Only the projectile continues down range.

http://en.wikipedia.org/wiki/Sabot

[Gaffer]

I know that part. Like the plastic surround a sabot slug in a load-your-own muzzle loader.

I was talking more about the actual final sabot that is formed on an M-1 Sabot round shell.