OK I have been thinking on this b/c I haven't found info yet. Say you have a 3x9 - 4.5x14 what ever and you Don't have a FFP reticle is it best to zero at the "middle" power? The reason so that your not so off on longer shots as power changes. If this makes sence that would be great but I have been doing this for years. Seems like I have less worry about how much is what at where with this set up. Just run come-ups and press. Now this is not for Miling range at xPower just to zero.