I’m really having a heck of a time with my M70 Winchester 7mm-08 with a 9.5” twist. Have been playing with the RCBS 28-168FN cast of Lyman #2 sized to .285”, lubed with X Lox 2500 Plus and seated at the lands. It shoots very well with low velocity (1300 fps) loads, as in less than 1” for 5 shots at 100 yds with 9 gr. Unique. I’ve tried 2400, 5744, 4198 and RL7 all with the same results. When the velocity gets any past 1400 fps, it all turns to used food. Group size increases to 4” and up. I have also noted that the boolits are tailing or leaving slightly oblong holes in the target. What I really wanna do is accurately shoot this bullet at 1800 fps or maybe a little more. So what am I missing here? Is this a bullet quality problem? If so, where?