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Sure Gbro! First of all I have my rifle zeroed for 100 yards. Then I used the gps to confirm the 1200 yard range (GPS accurate to about 10ft on a good day). I have an older smart phone that I picked up on ebay for about $10 and download a free ballistic program called Balcalc for it. It is pretty accurate when comparing to other known good online ballistic calculators. the programs are pretty good for elevation and wind adjustments, but most do not account for spin drift or Coriolis effect. when shooting real far those are some things to consider. So After dialing in the adjustments I take shot and quickly get back on the scope to see the impact to make further adjustments.
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