Hi Marc,
This long range stuff is just a bit of fun at present. I don't think anyone is taking it seriously but it might lead to a better understanding of what happens to pellets at 55yd FT distances.
Harrys famous 150yd groups are looking pretty unlikely here, as the majority of us have 12ft/lb rifles and conditions are way less than perfect. There have been some interesting results though, but I take them with a pinch of salt until I've seen them myself.