I just bought a 15 in. 7mm08 barrel for my encore and I didn't have any loads made for it. So, I bought me a box of Winchester Supreme (in the gray box)140gr. anyway, when I finally got some time I started working on getting my brass ready to make some loads. Well. in the sierra mannual it states that the length (just case length) should be 2,035 I measured the factory winchester cases (the ones that had been shot) and they measured 2,045. Out of a box 20 rds I shot 18 because I wanted to measure the complete oval of the factory round and with the other one I wanted to pull the bullet and wiegh the powder charge. I know there is no way of knowing what type of powder the bullet company uses I just wanted to know the weight. Anyway, I ended up measuring the case (that was not shot) and it measured believe it or not 2,025. So, the winchester cases stretched a total of .20 thousands. Has this ever happened to anyone else? What would you think caused this problem? I called sierra and spoke with a tech. and he said that it could possibly be the cases were out of spec.
