For anyone else who might be interested in running Applied Ballistics on a tablet, after 3 failed purchases, I have finally found one that works perfectly.
The highly reviewed new Google Nexus 7 Gen2 has 2 GB of ram and 16 GB of memory. The app loaded like a charm and works perfectly, along with Google Earth. The 7" screen makes things very easy to see and operate as compared to a cell phone, for those of us with fat fingers and/or aging eyes. For $229 at Walmart right now, it was a bit more than I was hoping to spend, but it is very high quality for the cost, and also gives shot angle and compass direction for Coriollis effect. When connected to WiFi, it gives altitude and baro as well, but that has no use in the field where Wifi is not available of course.
The reviews say that you can also use it to download and watch movies in HD, as well as take high quality photos and video with it, but that's not what I bought it for, so mine will likely only see use for running ballistic calculations and browsing the web at times. Hopefully this information helps others.