Free: Contests & Raffles.
My bet is the Chrony you're using and if it's even calibrated correctly. Rest assured though.......they're stupid rutting bucks in November and you'll get a follow up shot or two
Maybe it's gotten better over the years, I don't shoot much factory ammo so can't say, but it's been my experience with chronographing factory ammo that it tends to be all over the map and the stuff I've run across a chronograph is usually slower, sometimes a lot slower, than what is printed on the box. I had some 338-378 ammo from Nosler that was over 200 fps slower than what they claimed but Nosler tends to embellish their numbers a fair amount too.I think if you're consistently within 50fps of what the box claims and you aren't getting extreme ES numbers, for factory ammo, that's probably pretty good.