Factory barrel. Berger 60 match grade flat base varmint bullets, 43.2g IMR 4831, Remington brass, rem 9-1/2 primers. MV 3500 FPS. 1/2 MOA out to 320y starts to open up beyond that. My other load is 52g Berger match FBI target bullets, 39.9g IMR 4064, BR2 primers, nobler brass. MV low...