Re: smart phone ballistic calc. programs.
I will try it and check it out, but Shooter seems to be uncannily accurate for me. Shooter is one of those apps, that for large caliber ELR shooters, pays for itself by the missed second shot and then keeps on saving you money big time. At $6/round (retail value) for 338LM, spending $9.99 on a piece of software that gets you on steel first shot at any range is worth alot. I wouldn't want to pay more than $10, but it's true economic value is much higher for those that put in the effort to input accurate atmospheric data, MV and BC's.
Before Shooter, we were using tables tabulated by an experienced shooter for rounds approx like ours, same bullet different MV, and with approx adjustments for temperature, but not altitude. And we'd waste 2-3 rounds adjusting initial table values to correct adjustments. Once I got good data input to Shooter (along with a LRF), the whole range milling and table reading became a thing of the past with hits on steel first time almost every time.