I went with a Sightron SIII 45x45 in TPS TSR Xtra Low rings because the stock I originally planned to use doesn't have an adjustable cheekpiece. Now that I've got it in the Kestros, I'll probably put some taller rings on it to reduce the pressure of the cheek weld. For BR shooting, I'm finding that the less overall 'hold tension' - for lack of a better term - I put on the rifle, the better it shoots. Be interesting to see what I find when/if I put a bipod on it and get set up to shoot F-Class - might not be as easy to minimize my hold while I'm prone.