My friend and neighbor Rick who's been using Sierra's program a long time said his Sierra program was very accurate out to 1500 yards with his .338 LM.
But after looking at Patagonia's program he said it was a lot more comprehensive software. And that it seemed to cover all the base's and was much more in depth!
He liked it and he was my thermometer as to rather I'd buy it or not. Because of his extensive experience with many different programs I trust his judgment.