The 6 sst was brought to life today by Eric Goss AxisWorks Tempe Az He ran some virgin prepped brass (300 saum parent) with 110 Sierra's and 58-61 grains Retumbo @ 2.883 coal. Velocity ran 3300-3475. It looks like about 55.5 grains will run max PRS velocity at very mild pressure, and we expect, good barrel life. Eric said that 8 different loads with magspeed bayo attached went under 1"!