I recently picked up a legendary arms pro II chambered in 280 AI. Topped it with a vortex viper gen 2 5-25x50.. Ive put over 200 rounds down the tube and done load development with Berger 168’s, Nosler ABLR 168’s, Sierra game changer 165’s, and Hornady eld-x 175’s. As well as some factory Nosler accubond 140’s and Hornady eldx 162’s... during load development I would have some loads group great(.3-.6) and then have that same load shoot over 1.5 inches the next time I try it, this seems to be the trend with any loads I have tried. A load with shoot a bug hole once, and then won’t do it again. The most consistent thing I have tried has been factory Nosler trophy grade, with 140gr Accubond, grouping anywhere from .4” to 1.5”... this is not ideal for what I want out of this rifle, I would like to be in the 160-180 weight class.. any input is appreciated.