Re: Need Ballistic calculators help.
If you have MOA dope, just divide it by 3.438 - 3.44 is close enough - to change it to mil dope.
You haven't provided enough information for me to try to figure out why your dope doesn't match the JBM calculation. Here's what you need to know, minimum, to set up JBM:
Ballistic coefficient
Bullet weight
Caliber
Muzzle velocity
Sight height above the bore. This is not a critical measurement. Use a rule or tape measure to measure from the center of the bolt to the center of the scope tube.
Zero range
Temperature
Atmospheric pressure - this is the tricky one. See the section on entering atmospheric parameters in this link:
http://www.arcanamavens.com/LBSFiles/Shooting/Downloads/Baro/
Humidity - however, if you checked the box which says, "Standard Atmosphere at Altitude", that box will not matter. That's one of the reasons why it's better to have your own pressure reading, because then you can also enter the humidity and it will calculate that.
Down at the bottom, check the boxes which say:
Elevation correction for zero range
Target relative drops
