Sabot APHE-AT? Higher AP*KD and HE payload at the expense of HEAT frag damage in a pure GP gun. Found these quite effective in the AotE campaign where breaking HA beams was
Mario Valentino Original Vintage Shoes Sabots Collectibles - Etsy
ML-Sabot-Overhaul-2 - NORTH AMERICAN MUZZLELOADER HUNTING
Accelerator Type Sabots for .30 Caliber Cartridges (100)