A 22-250 I shot a lot, was perfectly accurate using Hornady 55 gr. spire points. The velocity was about 3600 ft./s. BUT! They were great at 100 yards, but at 250 yds. the groups were scattered, as big as 6-7 inches. I changed scopes, no improvement. I was talking to a gun shop guy I trust a lot, and mentioned that I was thinking of getting rid of the gun and he suggested trying a different bullet. I went to 50 gr. Vmax and the groups at both distances improved a lot. Then with 40 gr. Sierra BK', the groups got even better and more consistent. That round has been excellent for grass rats over 300 yards many many times.
The question this raises in my feeble mind is, as the bullet travels down range, does the rate of spin slow significantly? Just because velocity decreases, I assumed (ASS-umed) spin rate would too.
What do you guys think?
