6.5 Grendel
Overview
The 6.5mm Grendel (6.5×39mm) is an intermediate cartridge designed by Arne Brennan, Bill Alexander and Janne Pohjoispää as a low-recoil, high-accuracy cartridge specifically for the AR-15 platform at medium/long range (200–800 yard). The 6.5mm Grendel design goal was to create an effective 200–800 yard STANAG magazine-length cartridge for the AR-15 that surpassed the performance of the native 5.56mm NATO/.223 Remington cartridge. Constrained by the dimension of the magazines, the Grendel designers decided to use a shorter, larger diameter case for higher powder volume while allowing space for long, streamlined, high-ballistic coefficient (BC) bullets.
Stats
| Ammunition Type | Damage | Bullet Velocity (m/s) | Barrier Penetration | Armor Piercing |
| PPU 110gr | 10.7 | 830 | 1.8 | 4.4 |
| TSX 120gr | 11.5 | 810 | 2.15 | 4 |
| TTSX 120gr | 13.85 | 810 | 2.6 | 4 |
| TTSX 100gr | 12.45 | 850 | 1.6 | 5 |
| AP 125gr | 9 | 820 | 4.2 | 118 |
| SLAP 85gr | 8.41 | 1021 | 5.3 | 164 |
| Lapua Hunter 265gr | 17.41 | 680 | 5.3 | 10 |
| Berger VLD 130gr | 12.2 | 770 | 1.75 | 4 |
| Wolf FMJ 100gr | 12 | 850 | 1.9 | 5 |
| Wolf FMJ 123gr | 13.8 | 810 | 2.5 | 4 |
Note: Barrier penetration represents the rounds ability to go through walls and barriers. Armor piercing represents the rounds ability to penetrate body armor plates.