Re: Can changing a stock alter your average FPS?
the short answer is yes, but not in your case.
60 fps based on only the stock not likely.
If you changed from a 2 lb stock to a 20lb stock you would likely see a small increase not 60 fps, may-be 20-30fps.
since you don't crono all loads from the rifle, pin pointing the precipitant to the change may be difficult. Very small differences could change your speeds; barrel wear, brass lot change, hardening of the necks, neck weld, the list goes on.