I'm building a 300 prc and my mpa esr chassis accepts aics style mags, Which accurate mag would work with my build the 300 WM or the 300 Rum? I plan on using the CIP 3.850 mags!
Thank youRuger supplies a CIP length 300 WM magazine with their 300 PRC RPRs. Mine also feeds well from a 338 Lapua magazine. It strips and feeds the cleanest from the 300 WM magazine.
The 300 PRC case is 0.020" smaller at the base than the 300 RUM. That's just enough to keep it from binding in the 300 WM magazines.