07-27-2011, 11:59 PM
LRRPF52 Wrote:One thing I have noticed is the numerous references to 6.8 loads with the 85gr bullets at velocities at or over 2800 fps, and then using that as an example of the superiority of the 6.8 SPC to the Grendel, when I don't even recall anyone trying any 85gr projectiles in the Grendel yet...The greater popularity of 6.8 SPC has enabled development of a broader range of cartridge-specific bullets than for 6.5 Grendel.
However, even if 85gr .264" bullets were to become available for 6.5 Grendel, it still couldn't match muzzle velocities of 6.8 SPC. For one thing, there's a 5,000 psi difference in chamber pressure. For another, the larger "piston area" of .277" bullets lets them be pushed faster, even if chamber pressure were the same.