HornadyA(R) Subsonic Ammunition - designed for accuracy and performance below the speed of sound - now comes in both rifle and handgun loads.Subsonic Handgun utilizes triedandtrue XTPA(R) bullets that expand reliably at subsonic velocities. The SubX bullet used in Subsonic Rifle features a lead core. Long grooves in its gilding metal jacket combine with the bullet's flat profile and the patented Flex TipA(R) insert within its hollowpoint cavity to help it expand reliably at low velocities.Powders are selected for optimal performance and consistency from lot to lot.Gun manufacturers include: Aero Precision, Ballistic Advantage, Brownell's, Carbon Six, CMMG, Faxon, KAK Industry, ODIN Works, Palmetto State Armory, Preferred Barrels, Primary Weapon Systems, PROOF Research, Seekins Precision, Stag Arms, Uintah Precision.Specifications:Cartridge: 338 ARCBullet: 307 gr Sub-XA(R)Product Line: SubsonicSectional Density: .384Ballistic Coefficient: .375 (G1)Application: Target/MatchBOX COUNT:20