This going to be a bolt gun or AR? In my experience the HPBT is very easy to get to shoot well and the Amax is a bit more sensitive to seating depth. Ask just about any Highpower shooter and they'll pick the HPBT for mag length loads out of an AR because they jump a long way and tolerate it well. If you single load you can get closer to the lands and play a bit more with the Amax.
