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At 100 yards you are getting transonic speeds which opens groups.
It happens between 75 and 90 yards. This why people who shoot 22lr at long range use subs, no trans issues.
I shot minimags in a match last month and won because I had my dope perfect. Others had not done the actual shooting and just used guesstimates.
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Makes sense, transonic flow is a bitch for aircraft. Just a theory, but could the hollow point on certain rounds prevent boundary layer formation around the bullet, mitigating these effects?
I will be testing various velocities in the near future and post an update. My recent issue has been catching a severe case of the archery bug. At least I'm getting a lot of practice with holdovers. It won't be until February before I'm taking 50yd+ shots on squirrels.
I did swap out the scope for another 3-9x I had laying around with quick adjustable turrets and a zero stop. It has MOA hash marks, so I can compare holdovers vs doping on my next trip.
I'm most curious about the CCI 45gr I got. The only ammo I've ever had actually be subsonic out of my RAR in Bama air is CCI quiet. I'd like to see how subsonic ammo that isn't massively downloaded performs.