I noticed in my research than many post the trim to length for the 280 AI at 2.525, whereas the Sierra manual post it as 2.515. I then noticed in the manual diagram the case size showed 2.525 also. Then read else where you're supposed to trim .010 below max case length. I guess I never paid much attention to the fact that the trim to size was always .010 less than the size shown in the diagram. I guess my question is what are you trimming to? If you're trimming to 2.525 why that as opposed to suggested trim to length?