Good point 1588. I use small base dies for the AR10,AR15,M1A,M1G and Scar 17s. They all feed with out issues. I do run a slightly lite load on the M1A using 175 Nosler CC at IMR 4064 it pretty accurate and cycles fine. On the M1G I shoot 150 or 155's and keep the pressures down as it is 1944...