12-04-2013, 05:07 PM
Brian Wrote:I have a 20" Grendel and a 22" 260 bolt gun. With 123 Amax's I get 2575 out of the Grendel and 3000 fps out of the 260.
It's been reported in these Pages that a 6.5 Grendel-chambered CZ527 bolt gun, with a 22-inch barrel, gets 2650-2700 fps with the 139-grain Lapua Scenar projectile. But, getting back to the original point the OP brought to this Thread, "velocity data for the similar weight/the same bullet shot out of a 16" barrel for both the 6.5 Grendel and .260 Remington," and extrapolating the reported velocities of the 22-inch-barreled 6.5 Grendel bolt-gun to what might reasonably be expected from a 16-inch barrel, I think it's fair to state that, at least when compared in the short 16-inch barrel, the much larger cased 6.5mm Creedmoor and .260 Remington cartridges don't represent a significant improvement over the 6.5mm Grendel, when fired in bolt guns/actions of similar strength. Indeed, having run the numbers some months ago, I elected not to rebarrel an AR-10 to the 6.5mm Creedmoor or .260 Remington, given one of my parameters was a 16-inch barrel.