I use iSnipe and iStrelok for my ballistics and reticle information. Great stuff if you have an ipad or iPhone. I really like the iStrelok and how it shows impact distances for your BDC (or MOA or whatever) lines or dots and does it for just about every reticle in existence (S&B, Nikon, Leupold, Premier, USMC, Army, Russian types, etc.). Amazing.
And I sight in my rifles to be on at 200 (about 1.5 inches high at 100). I am considering switching to one inch high at 100, since I will from time to time shoot a bit too high. But I tell myself that the diff is only half an inch at 100, so it's insignificant. So I'm still at 1.5 high at 100. No way I could be successful with a rifle sighted in at 3 inches high at 100.