I'm a fan of the Leica 1600B as others are. True the Internal ballistics calculator is not that great, but I do use the temp, pressure, and shot angle measurements from it for my ballistics app. Then use a small handheld wind meter.
I just cannot see having the rangefinder build into the scope. Rangefinders have electronics and in a scope are subject to repeated recoil jolts. That cannot be good long term. Plus, if the ranger is in the scope, then you have to get the rifle out and point it at something whenever you want to range anything. I use the rangefinder a lot for range estimation when I don't have the rifle out. Sometimes just to figure the distance back to my truck. And I don't need anymore bullet holes in my truck.:rolleyes: