I have been running a 7wsm s/a since 2008 using Surgeon bottom metal and AICS mags with the plate removed and lips spread apart for 7 rds without so much as a hiccup. Somewhere along the way I picked up an Alpha 10 rd wsm mag as well. Although 10rds is a tight squeeze, I have run this lone mag for all ten round stages for at least four years w/o a hitch. While this is a minute sample set, it has worked for me.