<P> Rimfire bullets are generally either plain lead with a wax coating (for standard - velocity loads) or plated with copper or gilding metal (for high - velocity or hyper - velocity loads). The thin copper layer on plated bullet functions as a lubricant reducing friction between the bullet and the barrel, thus reducing barrel wear . Plating also prevents oxidation of the lead bullet . Lead tends to oxidize if stored for long periods . On a plain lead bullet, oxide on the bullet's surface can increase its diameter enough to either prevent insertion of the cartridge into the chamber, or--with high velocity rounds--cause dangerously high pressures in the barrel, potentially rupturing the cartridge case and injuring the shooter; for that reason, standard and subsonic cartridges usually use a wax lubricant on lead bullets . </P> <P> The variety of . 22 LR loads are often divided into four distinct categories, based on nominal velocity: </P> <Ul> <Li> Subsonic, which also includes "target" or "match" loads, at nominal speeds below 1100 feet (335 meters) per second . </Li> <Li> Standard - velocity: 1120--1135 feet (340--345 meters) per second . </Li> <Li> High - velocity: 1200--1310 feet (365--400 meters) per second . </Li> <Li> Hyper - velocity, or Ultra-velocity: over 1400 feet (425 meters) per second . </Li> </Ul> <Li> Subsonic, which also includes "target" or "match" loads, at nominal speeds below 1100 feet (335 meters) per second . </Li>

What speed does a 22 caliber bullet travel
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