If you don't have your parallax set right and you come off the gun every time you cycle the action, yeah but that's more of f PEBCAS issue than a scope issue. Vertical stringing can also come if you keep aiming at your last bullet hole or keep trying to correct for the last shot being lower than expected while shooting a group. Basically, all PEBCAS issues. Other stuff, thin light barrels, bedding issues, scope mounting bits problems, plain old sucking at shooting. I suspect you have 2 or more things going on if the string is 8" tall at 100yrds.