Lehigh Defense Maximum Expansion, 300 Blackout, 194 Grain, Fracturing Tip BTHP, 20 Round Box LA300BLK-194-ME Lehigh Defense Maximum Expansion Technology is used to produce projectiles that create the largest wound channels of any bullet on the market. These cavernous hollow points are designed to expand upon contact with a fluid-based medium through hydraulic energy. They do not expand on dry mediums like wood, drywall, bone, or sheet metal.