Short story; barrel is a 16" chrome lined from a decent manufacturer/sales unit. Initial results were consistent true sub MOA for 5 shot groups. Changed clean muzzle direct thread suppressor to an AAC BrakeOut, and SR-5 suppressor. Other change was from ACOG to S&B 1.5 x 6. Inspection of crown shows no damage awaiting a friends bore scope evaluation. Rifle is now a 3 MOA POS.
These changes were reversed but inaccuracy remains.
My gut feeling is somewhere in the pipe some chrome came loose.
A fellow shooter suggested that maybe the gas port is an issue.
Any suggestions before yet another tomatoe stake finds it's premature way to the garden?
Interesting occlusion, so other than the lands starting at irregular intervals, and the GP showing normal erosion, the crown passable, the little occlusion in that land... what could happen. Still leaning to trying a better optic and the remaining ammunition previously proven.
Firing was done clockwise after getting a basic zero (4) rounds of fouling. Round #4 jumped out and #5 was back in. Came one additional click to the left and the first 3 in second group were together, then not :-) Last five above were fired at a quicker pace to alleviate some of the variable wind conditions... Blustery 8 - 12 MPH, squirrely conditions. FWIW, my 11.5 with ACOG 4X shot better with 3,700 rounds logged. Lower is a old Colt with a Jewell trigger that breaks better than my Giessle Hi-Speed match's.
My thought is you lightly kroil the bore and see what that missing chunk area looks like next.
Range day 5 13 21, 93F 10%H 12 - 15 MPH @ Desert Sportsman's club Las Vegas, range #9, distance to target: 100 yards:I can live with this level of "precision. Not what was but not unacceptable either.
52 grain Berger FBHP and VV 130 Velocity 2963 SD 13.2/ES 29
62 grain Hornady BTHP and BenchMark velocity 2960 SD 17/ES 35
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