You could go big and get one with Applied Ballistics comps built in.
I have the sig kilo8k-abs.
I usually use it though the AB Quantum app, but it's not 100% necessary as any of your shooting profiles can be uploaded to the unit itself.
Makes pulling a rifle out, ranging a target at 700 (or much more), making the necessary dial or hold, and getting off the shot about a 10-15 second affair.
It pulls all the environmental data, minus wind value/direction, from itself. But it does allow you to input wind value and direction, and the built in compass will give you the proper wind holds upon pulling a range.
It's definitely a cheat code.