So I tried the same exact 75 HPBT loads with LVR through my AR today. Mines an 18" upper, 1-7, 1x8.5 Bushnell with a Geiselle G2SE in it. Otherwise it is dead stock. This barrel is pretty much brand new other than the two test fires I did at the house.
So I had about the same exact dismal results as my buddie's AR from a couple days ago..