I always firmly slam the mag into the well. For the unfamiliar, an inserted Mauser Hsc mag-whether loaded or empty-is required to release the slide. Quite often the round only strips approx. 1/4" fwd. in the mag. The ammo is always fmj. Even when it does chamber/fire the first round as it should, sometimes one or two times with the remaining rounds, the slide closes only within about 1/3" from the forward limit. From there it is easy to push it into battery.