Following on from novices thread about change of zero when removing mods, I have often wandered this myself but I have to say I have not had any problems with mine so far, touch wood!
However, the other weekend I stayed with a friend in the borders and took a very nice roe buck my first of the season. Trying to get photos off the phone!! Was a lovely weekend.
In the morning we zeroed our rifles and mine was bang on, sub moa at 100 yards with factory ammo.
We then thought why not have a crack at 200 yards seeing as we were there! His rifle shot like a beauty and my shots grouped nicely, dropped 2 inches as expected but off to the left by 3 inches. No wind, lovely sunny morning on level ground.
My set up is A10 Stealth mod on Sako 75 Varmint .243 wooden stock. Factory Remington Accutip 95 grn.