I have a six month old 2008 Limited Edition Model 70 Featherweight. I have been working up some 165 gr Game King with three different Hodgdon powders, using all winchester brass. I load 12 of a given powder charge, use 4 different charges. I shoot them in 3 shot groups. That gives me four 3 shot groups for each powder charge. When I get home I measure each group, put that information in excel. Each cell has the group size in it, than I make a cell for Average and S.D. Powder A four different charge, each with four 3 shot groups. That is total of 16 groups averaged .88. Powder B with same as above average .88. Powder C with same as above .63. Today I went to the range with the chronograph and the best four from above. I used LC brass the was once fired from my brother M-1. I am so discourage that I don't even want to measure them. Three groups were over 2", the best was around 1.25. Most were 1.375 to 1.625. I can toss rocks better then that. The only that changed was Winchester brass to LC brass and me. Has anyone ever seen that big of change in brass? I know I do have bad days but not that bad.