My personal experience , I would highly recommend the Sierra 100 gr HP. I have shot this bullet in my 6.5's from 3200 fps to over 3700 in my 264 mag. Have always held together & delivered exceptional accuracy from 1/8 or 1/9 twist barrels. This bullet has never blow up between the rifle & the target . I have had the TNT disintegrate when pushed too fast. Probably not a problem with the 260.
