I am still several months out from getting my GAP-10 .308 but have stocked up on components and pmags. I plan on using 178 AMAXs with Reloader 15, Lapua brass and Large Rifle Magnum primers as I have several thousand and my buddy uses them in his AR10. What OAL are you guys loading the 178 AMAXs to in your GAP-10's? Mag length?