First question is how are you resizing your brass? Also, not to bust balls, but you are 4 grains over book max on the 160 gr Nosler load with that powder. If you are in fact running those speeds, you are pushing the limits. Nosler lists a max of 63 grains at a velocity of 3,058 fps. That is with a 24" barrel, so you should expect another 40 fps over their book max. Also, Nosler suggests an OAL of 3.290", so I'm wondering if your chamber throat was cut short? How far off the lands are you running?
