The fact that they hit that distance apartmakes sense, really. The 300s are heavier and therefore hit lower.....very simple logic. That doesn't explain that high shot though. The only clue I would have is the hot barrel versus the cool barrel, as was suggested. When I fired that shot, I waited a couple minutes. It is definite that I shoot best when I load rather quickly and only fire 3 shots. If I swab, it seems to throw off my POI.

If I just did that I would hold better groups. I'm sure we all would.