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ballistics programs

I have Pesja ballistics program downloaded on my palm pilot. I shoot long range for the most part. When I punch all the info in on my palm I get the moa and windage back. The strange thing is that to be accurate, I have to subtract exactly 1 moa on the trajectory to get it accurate. For instance, if the program says my moa elevation is 11.5 then I have to crank in 10.5 (nightforce scope). If I run the same info through Jbm online, it comes out spot on at 10.5 moa. I thought maybe it was just me, but a friend has the very same thing happen. Has anyone had this happen? Shoots great as long as I subtract one, but just a little confusing. TF
 

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