Guys,

This is a very interesting topic!

Hadn't heard about this "gyroscopic precession" before. Will have to look this up later.

Have found that the 160 gr GameKings and AccuBonds do pretty good @ 100 yards (.7" and .75") in my custom Sako 7MM STW hunting rifle, but do very well further out; 3" @ 400 yards and 1.6" @ 300 yards, respectively (when I do my part!).
This didn't add up to what I'd read or been told before.
(1" @ 100 = 2" @ 200 = 4" @ 300 = 8" @ 400)
The only random guess I've received of late was a question about the muzzle's crown.