Our roving Brownells Gun Tech, Caleb Savant, is back to conduct another "caliber comparison" for us. This time, it's two AR15 cartridges: the 6.5 Grendel and the 6.8 SPC (aka 6.8mm Remington SPC "Special Purpose Cartridge"). The 6.5 Grendel has a highballistic coefficient .264" bullet, while the 6.8 SPC has a largerdiameter .277" bullet. Both have the same 2.26" OAL as the AR15's standard .223 Remington / 5.56 NATO round. The big difference is the 6.5 Grendel's faster velocity and flatter trajectory. With the same bullet weight, it'll be about 100 fps faster than the 6.8 SPC. At a 100yard zero, the 6.5 Grendel will drop about 8.5" at 300 yards, while the 6.8 SPC will drop 10.5" at the same range. The Grendel has about 200 ftlbs. more energy both at the muzzle and downrange. The 6.8 is a bit better on closein targets, while the 6.5 is better for reaching out to more distant targets. Caleb to favoring one of them..... Which is yours? Tell us in the comments below.

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