Measuring Scope Height with a 20MOA Rail ??

[yobuck]

As previously mentioned, measuring & adjusting to fit dope seems to work the best for me. I measure at the turrets, then tweak it to fit actual poi at range

Just assuming you meant to say (everytime) you visit the range.

 

[BallisticsGuy]

1, it doesn't really matter. Only the first number after the decimal matters until you get to ludicrous ranges.
2, measure from the center of the erector

You can be off by a quarter inch and it won't make a lick of difference. Being off by a half inch will make a small difference at long range and none at all at short/medium range.

 

[FEENIX]

Zombied after 11+ years. I hope the OP has figured it out by now.