A few things I always check/confirm if things aren't quite working out...
1. reconfirm zero, particularly if you are always shooting X clicks high/low consistantly
2. recheck data input, I once put the scope above bore height in the zero height field. Caused some head scratching after confirming zero... previous load had been spot on... I would check your zero range (as BB said), is it yards or metres, and should it be the other way round?
3. It could be BC related, are you using G1 or G7? Quoted BC's don't work in either my 338 or 7mm, both are pushing the projectiles out faster than the velocity range the BC's generally reflect, so the BC's I have settled on are higher
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