Just insert the plastic anchor directly into the chamber. I've never had any luck cycling them through the magazine. Dry firing a striker fired 22 pistol is a bit of a pain in the rear, since you have to cycle the slide to reset/cock the striker and cycling the action is going to result in the dummy/anchor being extracted and ejected. So having several dummies/anchors on hand to manually "reload" into the chamber will speed up the reset. The plastic anchors can be reused several times (try to avoid placing the previous impact point on the rim in the "strike zone" again), but keep an eye on the edges/rims. This description will immediately become clear after you have done it a time or two. When they become too damaged, discard them. The same goes for all 22LR/22WMR dummies. The biggest advantage for using the plastic drywall anchors is they are relatively cheap compared to dedicated dummy rounds.