In contrast, the 6.8 SPC case is 42.8mm. While there is a difference in powder capacity between the two, it’s not significant. Whatisnotable is the difference in chamber pressure: 55,000 vs. 52,000 psi. Unlike the .300 AAC Blackout, the 6.8 and 6.5 require a different bolt than the...
I used two different 300 AAC Blackout loads, one with 125 grain Sierra Matchking projectiles and the other with 135 grain Sierra Matchking projectiles. For each projectile type, I shot multiple 5-shot groups at 100 yards and calculated the average. For the 6.8 Remington SPC, I also used a...
That said, Smith & Wesson chambers its M&P15 AR-style rifle in .300 Whisper and states on its website that those guns can safely fire .300 AAC Blackout ammo as well as .300 Whisper ammo. .300 AAC Blackout in .300 Fireball AR? Since launching operations in 1989, AAC has financed mo...