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Old June 1st, 2010, 09:05   #40
m102404's Avatar
Join Date: Apr 2006
Location: Toronto
That FPS variance is within the variance margin of a lot of chronographs. Lighting, axis of barrel alignment, distance of muzzle from sensors...they all affect readings.

A wild guess is that the first set of shots loosened up your piston head o-ring and litterally warmed up any cylinder grease which does cause a piston to move faster (if the rifle/grease is cold).

We had some early season games this year where LOTS of guys seemed to chrony really low...but ripping off a burst of full auto before chronying resulted in a "normal"/expected FPS reading.

But jeez...40 posts into it and I'm starting to be convinced that a weak battery will affect FPS! My FPS must be dropping all day long at a 400fps rifle must not be shooting more than 350 by the end of the day....

What a crock of shit...if you believe that battery power affects FPS in a normal/typical spring gun AEG then you need to give your head a shake and look elsewhere for explanations.
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