So I've got a rifle chambered in 7-300 PRC and it's got a 22" barrel. I've tried both N570 and N565 with the berger 180gr hunting bullets and just can't get the speed I thought I would out of it. 3150 is the fastest I've got does anyone know if that sounds ok for speed? Not sure what a 7mm prc would do with a 22" barrel.