I was wondering if anybody had any data for a 208 amax for a sbr using a 208 amax and lil gun. Seems like I found a decent starting point at 6.6 grains at 2.240" oal but I shot it the other day and I swear it was breaking the sound barrier. Using a SAS ARBITER suppressor. I know it's 296 is what most people are using but I've got plenty of lil gun and h110.