I took it out yet again with the 178 amax and load getting 2888 with es of 19 sd 13. Performance still good and no impact changes as barrel heats as shot the 435 gong, then the 300, 200 100 as fast as could. barrel still not showing any copper fouling at all. I am a believer - if this rifle is par for the v2. I shot same powder under a 180 hornady round nosed as had them and just as accurate - about 100 fps slower, and drop chart different as expected, but accuracy still there. So far, it does not seem pickey re bullets