First, that's a pretty nice group. If it's all one load, I'd say you are getting the velocities right down to the nubs, if not great harmonics as well.
So, what are you shooting? Speeds, SD's ED's if you've got them etc.?
Agree with those above, at that range, a small wind call miss seems big. And, as noted, parallax can get really tricky to nail right on at distances. It takes several checks to get it as close as you can. One thing I do to help mitigate that is practice lining up on the scope correctly (or the same at least) every time. Just in case my parallax is out just a tiny little bit. Get a sight pic and walk your head in until the sight picture meets the edges perfect every time. I practice that often. Just trying to shave tidbits off my mistakes.