The ".223 REM 62GR SC HPBT" refers to a specific type of ammunition: a 62-grain, Solid Copper, Hollow Point, Boat Tail bullet for the .223 Remington/5.56 NATO cartridge. The "grind hard" description relates to its intended purpose, which can be for defense or hunting, as some versions are designed for extensive wound trauma with limited pass-through energy. This bullet type is often used by manufacturers like Grind Hard Ammo or others like Lehigh Defense to create ammunition with controlled fragmentation or expansion upon impact.