Methodically work through all your inputs and make sure everything is bang on incl your zero. Then adjust MV as much as necessary to produce the correct solution to match your real world results.
You can also do a tracking test to see if your scope dials true MOA or maybe it’s out a bit and dials less like Shooters MOA (1” at 100 instead of 1.047”). You can adjust your scopes dial from TMOA or SMOA in the ballistic calculator to best match and then ultimately adjusting MV will get it doing what you need. Everything else needs to be correct though.
300 isn’t all that far to verify a solution either. Try get out to 500ish if you can or further if you expect to shoot further then that.
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