I use them in my 308. Peoples experiences vary, and some people have had problems with the bodies expanding slightly when full and not fitting into the magwells. Ive got one that expands slightly but not so bad that it doesnt work in my XLR chassis.
Alpha mags and Accurate mags both work very well in my PTG bottom metal. The Alphas do expand but it actually works to my advantage because there is no more wiggle.
Thanks for the responses. I think ill pick up a few to try out. Being cheaper than factory AI mags i was a little concerned with how well they functioned. Im not to worried about a snug fit and its for range work. Not doing competitions as of now and can use the 5rd factory for hunting if i wanna pack the heavy bitch hunting.