My experience with the S&B 140 Boat Tail ammo out of my Cadex Gaurdian Lite 6.5CM, factory 24 inch barrel.
2765
2672
2704
2726
2688
2777
2704
2699
2726
2743
Easily produced sub MOA 5 shot groups (some .5 and none above .87) from 100 to 500 meters 60 degree, 10mph wind, 880 feet above sea level, low humidity. Shot 100 rounds with an Atlas Bipod, rear monopod, MK5 3.5-18 T3 and SIlencerco Omega. Hornady ELD Match 147 was a bit slower but the better BC made POI very close past 300 meters. That was all half moa or better if I did my part.
My brothers Fix shoots the S&B about 1MOA out of the factory 16 inch and Proof 20 inch barrels off an Atlas Bipod, Omeg and S&B Polar 3-12 P4 . It also shoots about the same out of our 16 inch gas guns. We paid around .55cpr delivered to PA so we bought a few thousand for banging steel.