For what it's worth dept.
Tried some SK std. + that I just got from Champion Shooters across my Chronograph-here's what I got: note-10 shot groups
Anschutz 1712:avg. = 1058 fps; ES = 27; SD=9
NS 522 : avg. = 1096; ES = 22; SD = 6
I didn't have time for multiple strings, but did clean and then foul both rifles before recording. The target was at 50 yards, both rifles grouped well. They both hit the paper in the same spot on different targets. I can't explain the big difference between the averages. I don't know if the twist is different or?
Your mileage may vary.