Wow Stalker, friggin good information.
I'll be switching to .28 bastards as soon as my 25s run out.
Also, please don't take this as shitting on your work, but deviation (or at least error on your average) is the highest measurement minus the lowest, divided by the number of measurements when you have 10 or less shots per condition. The actual formula is a bit more complicated, but that's a reasonable approximation.
Like I offered once before, if you want a hand doing data analysis, including generating equations (more accurate than excel can do) and simulating different variables, I have been doing a lot of this in labs and a data course, and to a point, enjoy doing some of it.