When I shoot anything 9mm or larger for a long time my groups will open up. Even the 9mm has recoil. In order to re-center myself I will pickup the 22 and fire a mag or 2. This used to happen to me at 50 or so rounds. Now its more like 200 or more rounds depending on the caliber. For example 25 rnds is about my max with the 460s&w.