G7BR2 has the ballistic solver built in, which you can program for up to 5 different loads for your individual rifles. You range the target, the little leprechaun inside the box checks the angle (up or down), the pressure and temperature (density altitude) the distance and crunches all the data then spits out your ballistic solution. You can have the solution in one of several forms: yards to dial, minutes to dial, or inches per hundred yards. Most users will choose the first or second option. You also get your windage for 5, 10, 15, 20 etc mph wind (you have to measure/estimate the wind speed yourself, the gadget tells you what to do about it). I've had mine for a couple seasons now and love it. It will range way farther than I will shoot, and give ballistic solutions to 1400 yards. The newest version goes farther, and will give solutions in MILs if you prefer that to MOA.