Ok I bought a Vortex PST viper 6-24 for a new build. The scope won't hold zero after you use the elevation turret. Zero is always at a different spot after turret back down. usually low. Like 3" to 5" low. I sent it it for repair and got it back to have it do the same. I talked to a tech guy at vortex and he thought my rings were to tight causing problems. I replaced the rings with night force and torqued it to there specs and re zeroed it. It shot consistently from 500 yards to 100 yards thought I was set. Then today at the range, I checked zero first and it was good. I shot 700 then 1000 then back down to zero and it is 3" low at 100. Then I turret up to 700 & 1000and it is consistently low. Again. Keep in mind this is shoot 3 shots and let cool, every time. I put the leupold on it to rule out a gun issue. It shot perfect with the Leupold. I am at a loss of what to do. Even if they repair the scope whats to say it won't happen again? I don't think I can trust this scope so I am stuck with a $1000.00 dollar scope I can't use. I have shot 250 rounds through this 300 RUM so far. I would really like to not shoot out the damn barrel trying to get the scope issue resolved. What would you do?