Progress update:
Based on our emails he lengthen a case to a very long 2.135" using the die mounted case stretcher BAC sells, the one produced by the gunstock checker. By repeated test fitting and trimming it in his rifle he found that cases stretched and trimmed to 2.115" was the desired length. He then made all his cases for that rifle 2.115".
Last weekend we held a silhouette match and I got to observe again. He has two loads. One, a dedicated 200 meter load using a lighter bullet for offhand chickens. He shot five which is good shooting anytime!
His other load used for P-T-R, using the heavy MB type bullet is not an accurate load and really does not hold the target well in any condition. Maybe a 3 MOA load. Hits are here and there so all one can do is bracket (center) the elevation as best you can guess and they land where they land somewhere in that larger circle.
He was planing on bedding the buttstock with a Brownell's bedding product next. We are going to meet and shoot test loads after he has completed this next step.