[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.

[Scrambler Bob]

The Sabot “bullet” has a lightweight, full caliber outer shell, and a sub-caliber, high density ‘core’ specifically shaped for penetration. Upon impact the outer shell is stripped off, and the high l/d ratio core has much concentrated energy to enable penetration.

[OldMissileer]

There is no “final sabot” formed on a sabot round. There is a kinetic energy penetrator that is very narrow and long and fin stabilized. The sabot separates right after leaving the barrel and the penetrator continues traveling at about 5000 feet per second.

The other armor piercing round is the HEAT (High Explosive Anti Tank) round. This round has a shaped charge embedded in the shell and detonates at a precise distance from the armor, sending a nearly pinpoint jet of hot gas into the armor, hopefully breaching that armor.