Desert Tactical Arms

[SHORT-N-SASSY]

I'm excited to see the Grendel offered in the MDR. It looks like this could be the answer to the need for an AR12 for the Grendel. That is if they utilize the .308 components for the Grendel.

The all-new Desert Tech MDR: a compact AR12 16"-barreled Bullpup!

Taking advantage of the 2.850"-long magazine and beefy (read: Bolt Gun) .308 Breech --- and given the short 16"-barrel length --- what muzzle velocities can we expect from the following 6.5mm cartridges, loaded with 139-grain to 140-grain projectiles:

6.5mm Grendel - 2500 fps (approximate extrapolated velocity based on the 2650 - 2700 fps with the 139-grain Lapua Scenar from a 6.5 Grendel CZ527 bolt-action rifle, with a 22" barrel);

6.5x45mm - ?

6.5x47mm Lapua - ?

6.5mm Creedmoor - 2578 fps ("139-grain Lapua Scenar" Short Barrel 6.5mm Rifle http://www.sincityprecision.com/?p=1503);

.260 Remington - 2575 fps (approximate, based on the "2558 fps, with 140-grain Hornady, from a 16"-barreled Ruger Compact in .260 Remington" http://www.shootersforum.com/ballistics-...stics.html NOTE: See Reply #7).

In short: what 6.5mm cartridge works best, in a 16"-barreled AR12?