Yeah, I'm that guy today.
Burris XTR rings have a <span style="font-weight: bold">FRONT</span> and a <span style="font-weight: bold">BACK</span>. If you put the rings on <span style="font-weight: bold"><span style="font-style: italic">backward</span></span>, don't be surprised if your tack driving sniper rifle starts grouping like a shotgun. For those that don't know, look at the locking screw on the under side of the rings and mate the flat side milled into the screw with the flat of the picatinny rail. Square peg goes into square hole. This can save you a lot of heart-ache, and wasted ammo, on the range.