I know this has been hashed over and over on this forum. As serious as you are with your shooting, you really need to buy the Oehler! With the proof channel you get two readings. I do not think there is anything more accurate than having one of these for the average guy anyway.
I would be willing to bet that if you get an Oehler, you would like it about as much as your rangefinder and Bergers
. Ok, maybe not that much but you know what I mean.