I got new 270 A-bolt SS left hand with Boss two weeks ago.Chorograph with 130Gr Winchester Ballistic Silver Tips,2811 fps at muzzle.I though with 22' inch barrel and BOSS there would be some loss but not this much.Winchester data shows 3050 fps on website.Still glad I got the gun with BOSS,first time out after barrel breaK-in less that an inch with Hornady Light Mag 130 SST' s less that an inch three shot group at 100 yards.Have yet to chrono the Light Mags will update more later.Just though everyone should chorograph the loads they shoot and see what the real deal is and not trust the factory charts.At 100-200 yards may not make a difference but 250+ could cost you a BUCK.