Hi all, I have been behind bolt guns for the past 25 years. Rem 700 with AICS in recent times. About a year ago I purchased a AI MKII, 20" with muzzle brake in 308. I have a Nightforce 5.5X22X56 with a AI one piece scope mount. All bolts/screws etc. are torque properly. 500 rounds have been sent through the gun. Cleaning procedure is always the same. AND I'm the first to belame ME...but I have taken me out of the picture. When firing the "Cold Bore" with a clean or dirty bore, the first shot is 2 1/2 to 3 minutes low at 100 yards. Then when followed up with four rounds, all four round are right on which you could place a nickle over. I've had other people fire this gun with the same results. I've also tried another scope and had the same results. Any ideas....I'm ready to go back to my Rem. Cant have a cold bore that far off when you do what I do...Fustrated. Thanks to all