heres the real question.
how do you define your +/- confidence interval?
if i use a 99% model, then my gun need to shoot less than +/- 1 for a string 2- or 30 shots to get a +/- 5 FPS rating.
if you use a 95% model then you need to shoot +/- 2.2 for a 20 shot string to get +/- 5 FPS rating.
since most poeple take 3 shots over the chrono and they range in the +/- 5 range, they say there gun is shooting +/- 5, when in reality we can see that there gun is acutally shooting (according to the 99% model), like +/- 30 FPS.
if you truly want to know what you gun shoots as far as consistency, you need to blast though AT LEAST a couple hundred over the chrono, recording every shot.
as i have done here with the impressive beast of a gun, the EMag - http://www.youtube.com/watch?v=mpUTWDY5NFE
if you look at the spread sheet, you can see that even though the std div of some of the setups were 1.8 FPS that still only means the gun was shooting +/- 5 FPS, and thats with strings of 20ish shots, where everyone but 2 shots were 291 fps.
that gun is a machine, and i have NEVER seen another gun even come close to that as far as chrono consistency.
so guys, it matter of how you define your +/- 5 FPS claims. if you take 3 shots and they are +/-5 that doesn't mean your gun is +/- 5, its more like +/- 30 FPS. whereas if you spend an hour over the chrono and take a few more samples, then your confendince interval gets a bit more accurate.
but according to the definition around here, my Emag was shooting +/- 0 FPS, but anyone with any sense at all would just shake there head.
the mythical +/- 5 FPS gun (according to any REAL model) is truly rare indeed. me and bryce have spent over 8 hours now with eveyr gun you can think of, over a chrono and NONE of them could shoot +/- 5 even with the EMag blasting 10-20 shoots IN A ROW all the same speed. thats still not +/- 5 FPS.