and so do hornady sst's.. i have a 300 rum and it likes neither the 180 gr., nab's, even set as close as .10 off, nor 180 gr. hornady sst's... i have tried different powders, re-25 seems to work the best, tried different oal lengths... and it will not shoot a nab under a 3.5 x 3.0 inch group. but, it loves 168 gr. barnes tsx's... now what's up with all this ???