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I'm asssuming you guys are measuring speeds with a crono? To get SD and ES results.
I've had loads that were crazy accurate when shooting 100yrd groups but after getting speed data realized they sucked for long range.I've also had a similar situation to what you are experiencing with my 308 CTR / Vortex HSLR (1 click = 1/2″ @ 100yrds) but the reverse. I thought I had everything dialed in with everything for ballistics but gun was “low” out past 550-600yrds on moa targets. I'd miss just below or catch the bottom of the target, a couple inch difference progressively getting worse the further I would shoot.
I had speed data, good accurate load worked up but my gun would not match drop charts out past 600yrds…but was dead on with a 100yrd zero… or so I thought. I had the scope checked by Vortex and no issues. I ended up re-zeroing the gun perfectly @ 300yrds. What I realized was I wasn't “perfectly” dialed in at 100yrds and 200yrd – 300yrd tuning cured the issue.
Try re-zeroing your rifle at 200 or 300 yrds to match you scope data. You POI might shift ever so slightly at 100yrds but it may mean the difference out past 600yrds on hitting moa target.
