Re: Vertical stringing
So, you are saing that your are getting groups 0.1" wide by 0.5" tall @ 100yrds, and 0.1" wide by 0.6" tall @ 200yrds? Sound pretty good. I don't see how your going to know anything concrete without knowing velocity spread. That's what I would guess, but you won't know for sure until you measure. I was having the same problem (bigger group size though) where the groups looked like a football. I finally broke bad and bought a chrony. Great investment, but I don't know how much help it will be in this situtation, since your talking about a change in velocity that will mostly be within the tolerance of your testing capability (unless your firing from a vise, that is bolted down, and your target doesn't shift "any" on impact). My Chrony at best is within 0.5% accurate. Just something to consider, since that is 15fps @ 3000fps.