I was very suprised by the velocities I was seeing too. So much that I chrono'd some pellet gun speeds and some other cartridges of known speed to see if my chronograph was off..........well, it was reading normal near as I could tell, some 25-06 ammo that's always shot right around 3100 was averaging 3090.?
They guy that suggested I try this cartridge said it would do nearly what the 6-284 would, and that it would beat or at least equal the 243AI. I didn't fully believe this, and not sure that I do still, but I'll see and have a better idea after chronoing some from this new rifle and chronoing some more of the 243AI. Could be that the older 6LD was just a fast barrel.? Could also be that we're running more pressure in the Lapua brass than we think we are? But I'm pretty sure it's also a highly efficient case, and that always helps