I've been trying to work up some loads for my Sako A7 300 win mag. This weekend I tried 3 different powders and 3 different bullets and shot 3 shot groups in 9 sets. Temperature was about 60 degrees with a 10 to 15 mph wind moving left to right with the target at 240 yards. I was shooting off a bench with sand bags and rifle butt support. I was able to get several decent groups and there were several that strung bullets either vertical or horizontal. After each 3 shot group the rifle was cool to touch. (about 20 minutes between rounds) Here are some of the better rounds and some of the ones I would like help deciding why this happens. All shot at 240 yards. 200 gr. Sierra Game Kings shooting 80 grains of H1000 1 5/8" group 185 gr. Berger Hunting VLD shooting 73 grains of H1000 1 7/8" group 185 gr. Berger Hunting VLD shooting 73 grains of 7828 SC 2 1/2" group 165 gr. Hornady Interlock BC shoot 75 gr. of 7828 5" group with a vertical string 200 gr. Sierra GK shooting 70 gr. of 7828 6" group strung horizontal. Just wondering why I would have a vertical and a similiar horizontal string. I was confident in my shot placement as I am using a 4X12 Leupold Var X II. Please let me know what you think.