Temp related. I've got a load for my CG 63 6.5x55, that I use only when there's snow. Shoots great, no pressure signs. But once it warms up its a different story. Rob Furlong talked about getting American match VS plain link ammo .50BMG rounds in AFG.I had a remington 700 in 243 that shot 105 gr. well in summer and keyholed in winter, couldn't keep them on the paper at 100
Quite possibly, as long as you compress the powder charge, depending, of course, on the specific brass you are using. While Nosler shows velocities of up to 2,887 fps, that takes a 107% charge. Their low load is still compressed [101%] & it yields 2,743 fps. My calculation was based on a 100% charge with QL's default case capacity as I did not have the OP's figures to work with, which differs from Nosler's case capacity.I Thinkyour way to slow at 2600 fps ! A LOAD of H1000 will give EASY 2850 fps ! PLUS .