When these first came out, they did not have a published B.C. Everyone was guessing .6 to .690 and even shooting them and reporting back high estimated BC. Then Lapua posted a rather low .574 and many were disappointed. Using the G7 BC I’ve “trued” my speeds cheap canada gooseto much faster than what the chronograph is showing me. I think the BC might the higher, but Lapua does test them using DOPPLER RADAR so I think they would have a better idea than most of us do about the BC. All I know is, 43.1g of H4350 in my 6.5 Creedmoor built by Aaron Roberts of RP RIFLES had me reaching 1130 yards w/ only a 9.2 mil come up. That’s either a really fast, or a really slick bullet! My trued velocity is 2930 FPS. One thing for sure is they hammer! I use this exact same load with the 140g Hybrids and it hits mil for mill with the 136Ls out to 1000 yards.
UPDATE. I have sent these rounds over a magneto speed chronograph and the result was 2940 FPS. I’ve used those speeds on my Kestrel 4500 NV w/ Applied Ballistics and the canada goose on sale data works great out to 1,300 yards so far. I’m hoping I can reach out to 1,500 yards soon and see how the Kestrel works w/ transonic ranges.