Well, Just got home and checked my headspace using the hornady tool. Which indicates a headspace of 2.044" +/- .001" . So with SAAMI specs being 2.048"-2.058" i should be fine. I will have to fire and let a few cases cool before extracting them to get an idea where my chamber is specifically. The factory stuff(PPU) i measured was 2.045" +/- .001". Dont want to make ammo specific for this rifle but safe for my 1903a3 and Garandicon.