From
http://www.network54.com/Forum/79537/message/1328049471/Brass+screw+and+lapping+compound+re-crown-+How+was+your+luck-
I dd some tests today at 10m.
Total group size..10 shots was 1/4" so about 0.03 ctc without the 1 flier that was my fault.... I need to do some trigger work. So all in all I am very happy with the re crown.
Its a huge improvement in how well the qb78d performs.
Bruce