Barnes’ new RRLP (Reduced Ricochet, Limited Penetration) bullets feature a frangible, powdered-metal copper-tin core inside a guilding metal jacket. The bullets are lead-free��"often a requirement in military and LE practice environments. These open-tip bullets won’t come apart in mid-air, even at very high velocities and extreme rates of spin. They combine accuracy with explosive fragmentation, and won’t destroy steel practice targets. RRLP bullets include a 55-grain 5.56mm (.224”) bullet designed for military-style autoloaders and other firearms with rifling twist rates of 1:9” or faster. A 140-grain 7.62mm (.308”) version is intended for tactical autoloaders and bolt-action rifles with 1:12” or faster twists. There’s also a 108-grain (.310”) RRLP for 7.62×39mm rifles. These multi-purpose bullets are designed for shooting steel targets, competition, plinking, hunting and home defense. This is not loaded ammunition.