I have not chrono'd those Federal loads, but I have more and can do so at some point. I have also not measured the throat but will get that done in the near future as well.
Until today, all of my 458WM experience was with a stock M70, and it was pretty nice. The R8 is a pretty amazing rifle though and I look forward to wringing it out more fully, and in comparison to a Mauser (soon) and an M70(who knows when).
Incidentally, the gun handles recoil so well, that the 12.75" LOP that is on it right now was no issue whatsoever. I had wanted it to be 13", but Blaser USA messed up a bit and took an extra .25" off. I'm still sorting though possible solutions to make it 13". I have a second Professional stock that is at Blaser now, hopefully coming home with a 13.25" LOP. We will see.
