That ammo is really sub-par for an '06's speed. My 24" M70 does 2,845fps with 180's and 2,964fps with 165's. I suspect,
although I haven't chronographed them, that the 150TSX I have accuracy tested, are running something over 3,000fps.

9 to 10 feet from the first screen is normal set-up distance for sky-screen-type chronographs.