I have a cooper 7 stw, which only allows for about 3.65" oal in mag. Freebore runs about quarter inch or more. I have tried various combos with 140 vld, 180 vld, and 160 accubonds, new, fl sized Remington brass, retumbo or us 869, 215m primers. Run out fixed to sub .001". Everything sprays 1 to 1.5" at 100. I expect sub 1/2 moa from my coopers. Any recommended bullets that jump well? Load combos? Any help appreciated.