6mm .243 Caliber (.243) 80 gr. Blitz SBT In rifles chambered for either the 6mm Remington or 243 Winchester cartridge, this 80 grain #1515 Blitz bullet is dependably frangible and has no peer as a varmint bullet at velocities delivered by these cartridges. The Sierra Spitzer boat tail shape assures a flat trajectory, good resistance to crosswinds and vertical winds, and high-energy delivery even at extreme ranges. Built at the request of numerous varmint shooters, this bullet will bring out the best in both a shooter and his rifle for all varmint hunting applications.