21C (a 220 grain Hard Cast plain based LFN) is the absolute heaviest bullet that can be fired through 10mm pistols. With its flat nose, it will penetrate straight and very deeply into muscle and bone. Straight line penetration into living tissue will exceed three feet.Specifications:Series/Collection: OutdoorsmanBullet Style: Hard Cast Flat NoseCaliber/Gauge: 10mm AutoBullet Weight: 220 grainMuzzle Energy: 703 lb/ftMuzzle Velocity: 1200 fpsCase Material: BrassApplication: Big GamePackaging Quantity: 20/Box