.243 in a AR15 - Varmint Grenade Cartridge - 6mm-223 Remington
The 6-223 Remington is a wild cat capable of take the 223 into a heavy hitter. Being able to shoot up to a 100 grain bullet in a AR15 16inch barrel makes this a heavy hitter in a smaller cartridge.
The 6mm bullet family offers many projectiles and many in the higher BC category. VLD bullet profiles may not work due to the magazine OAL limits