Range Report A comparison of ballistic programs vs actual Dope

[azimutha]

Re: A comparison of ballistic programs vs actual Dope

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Jeff in TX</div><div class="ubbcode-body">Last but not least is using barometric pressure or altitude. Pick one and never use both. Using standard readings on a ballistic program is always a receipt for inaccurate results. The most accurate results come from setting your ballistic program at 0’ altitude and using the actual measured barometric pressure. If you try to use both which a lot of ballistic program users do, your two fields with conflict and the results are skewed results.</div></div>

While the simplest thing to do is use an accurate, local uncorrected pressure (gotten from a weather meter or GPS unit) and zero altitude, it isn't correct to say that you can't use corrected pressure with an altitude. The results will be exactly the same (just as accurate) as long as both inputs are correct.

I would definitely try to use the uncorrected pressure and zero altitude. So when would you use the other method? When you can't get a local pressure and the best you have is from the closest weather station. If you know your altitude within 500 feet you will at least get in the ballpark with it, e.g. ~4000 feet and 29.76 from a nearby airport.