Re: Bore Sighting & observations
Another real obvious thought that crossed my mind last night.... is a bent barrel. Ask any of the good smiths how many perfectly straight barrels they have even seen? My current 1000yd BR LG barrel had 4.5 thousands of runout in it. This is not uncommon from what I've seen.
I also know of a barrel from a very prominent maker that had more than .010" of runout in in right out of the box. The shooter did his own work and physically tried to striaghten it the best he could in the lathe with another large bar for leverage. The same barrel cleaned my clock at the last NC match of the season. It will shoot!
It wouldn't take much to cause a 2-3 MOA offest at any distance. I know if your front and rear rests are 24" apart, moving your rear rest .0006" in any direction will move your POI 1" in the oppssite direction at 1000yds. So at 100yds that would be .006" of movement would equal the same 1" of movement. Translate that to a 24" barrel with .006 of runout, and you might have an answer to your "problem".
Or like Aussie said... if your happy with the accuracy of the rifle as it sits right now... I would go with the beer or 12 option also. Brand doeasn't matter after the 6th one anyway... though Yeungling is my personal favorite.