The ORIGINAL nitro 27's contained 21.5 grain of Clays International, all Rem. components, primers and figure 8 wads I was fortunate enough to be among the prototype testers, the second generation nitro 27's have 18.5 grains of Tight group powder and Rem. primers and TGT-12 wads, as the Tight Group powder is very dense, all factory ammo will read 30 to 35 ft. per second faster over our chronos than the OEM testing which reads the pellet mass not the lead pellet, if you reload and want to duplicate, keep this in mind. incinerate em!