04-15-2014, 01:45 PM
It's been reported in these Pages that 2650 fps - 2700 fps has been reached in a 22-inch-barreled 6.5mm Grendel-chambered bolt gun, with the 139-grain Lapua Scenar projectile and handloads, no doubt with the bullet extended beyond the 6.5mm Grendel's normal cartridge overall length, and at pressures well beyond the safe limits of the AR-15 breech system.
Extrapolating, it would seem reasonable to expect 2500 fps - 2550 fps from a 16-inch-barreled 6.5mm Grendel-chambered bolt gun --- not much different from the 2550 fps -2575 fps velocity the 6.5mm Creedmoor 139-grain Lapua Scenar projectile leaves the muzzle from a 16.5" barreled bolt gun.
The 6.5mm Grendel is an extremely efficient cartridge, which potential performance is restricted when mated to the limitations of the AR-15 breech system. We're back to square one.
Extrapolating, it would seem reasonable to expect 2500 fps - 2550 fps from a 16-inch-barreled 6.5mm Grendel-chambered bolt gun --- not much different from the 2550 fps -2575 fps velocity the 6.5mm Creedmoor 139-grain Lapua Scenar projectile leaves the muzzle from a 16.5" barreled bolt gun.
The 6.5mm Grendel is an extremely efficient cartridge, which potential performance is restricted when mated to the limitations of the AR-15 breech system. We're back to square one.