I shot 3 different 6x5s today. I used 2 different lots of SK Biathlon and a lot of SK Pistol Match. The Pistol match did the best. I used the last 6 groups. Average; 2.276" and best 1.39". 200 yards, Vudoo, NF 7-35 scope, Bi Pod, rabbit ear rear bag from a bench. I have had good results with SK Pistol Match in the past, but for some reason I have been shooting Biathlon. My averages with Biathlon today were 2.751" and 2.945".
edit to add: I used a better target today. I could see what I was doing.