I agree with the accuracy comment on sabot slugs! Overkill? No way! A sabot slug is smaller than a foster slug , but has much better accuracy at longer distances.

As far as shooting a foster slug thru your rifled barrel , again , no way!

A foster slug is for a smooth bore barrel. The quickest way to ruin a rifled barrel is to shoot foster slugs thru it. You can clean it and clean it , you'll never get the rifleing back to it's original state.