powerbelt uses a gas seal. Its a full size bore bullet. A sabot is an under sized bullet anywhere from .45cal to 40cal and the sabot takes up the extra space in a .50cal.

The gas seal on a powerbelt is mainly there to allow for easy loading and just as the name states, seal off has from coming around the bullet.

The bullet itself also expands in the bore and engraves the rifling.


As for sabots/plastic fouling up the bore, i never had any problems at all.