I've always been fascinated by the BOSS system and how it can match the barrel harmonics to a specific load.
The Browning web site has a video on this page showing how to set your rifle.
http://www.browning.com/customerserv...ail.asp?id=107
I guess you just have to go out and shoot a few groups to match your particular rifle to your particular load. I guess I'd take a chance and buy a few boxes of my favorite ammunition, maybe even making sure I got the same lot number and then see if I could get the BOSS system to adjust to it.