Well, it happens. I spoke of a group I shot with my .45 GM barreled flinter, containing 7 shots. After shots 1 to 3 - I had Taylor watch the target as the three shots made just about a perfect cloverleaf. Shots 4 and 5 went high and right, he just looked at me and said, "What happened" - I did not know. Then shots 6 and 7 went right back into the group. Go figure - IT happens. I was having difficulty uploading the photo from my camera into Windows 8.1. Well, they materialized after 6 months, in a file that had been present all this time, on the desktop - go figure.
Every one of the 5 shots in the tight group, can be counted, which is not normal for such a small group - normally. Had I been shooting a .50 or .54, with the same C to C measurement, only 3 would have been visible - possibly. I measured it at one time, but it is not noted on the target itself. It was between .4 and .5" IIRC. The two flyers have me baffled
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Obviously, I need a sight correction, of 2" to the right as well as a rear sight height correction as the group is 2" higher than I like. That is the difference a modification of the stock from full, to 1/2 stock made in the group location.