Speeds listed in the reloading bibles are listed as Muzzle velocity (MV)
My Chono has to be parked 10 - 15 from the muzzle of my 300 win mag.
It shows me improvements or failings of loads with changes made as I reload. I have wondered at times if I am attaining the MV listed in the manuals. Where they are measured at different locations, how would you know.
Is there a formula you use to make the velocities camparable?