Re: 139gr Lapua Scenars go transonic at 1000yd?
Trental,
You may have a Carbon Ring. I ran your #'s on JBM and at 1000 yards you are at Mach 1.233. I've seen carbon rings reek avoc on accuraccy at 600 - 1000 yards, and seen keyholing also. I could be wrong, but if I'm right it's an easy...