I ran bulletflight for awhile, but found that it was way off. I run Isnipe which was giving excellent elevetaion at 1760. The hard part was reading the wind. Going from open to buch to open to bush over a mile is hard to judge. I also run Field Fireing Solutions, on a Recon Pda. A little complicated to start, but once you figure it out its awesome. Even linked my kestrel to it via bluetooth. lots of features for scope calibration, BC calculations, velocity corrections, everything. I like it. But isnipe was way cheaper. lol