[SOLVED]Measure FPS Without Chronograph

[BitFrost]

Hi!
I've run into a slight problem as I don't have a chronograph to measure the FPS of my .25 FX Wildcat.
It's tested and specified to be around 910/Fps with the pellets that I've got. Should I take their word for it or do I have to find a way to measure?
Sadly there is no community for air rifles in my area(not even close) so I can't borrow.
Has anyone got any idea how I can measure without a chronograph?

-Krister

EDIT: Typos

 

[30cal]

Yes if you have a smart phone. It uses the speed of sound to measure the velocity. Not quite as accurate as a chronograph but should work for what you want. http://www.chronoconnect.com/?page=mobile

 

[BitFrost]

"30cal"Yes if you have a smart phone. It uses the speed of sound to measure the velocity. Not quite as accurate as a chronograph but should work for what you want. http://www.chronoconnect.com/?page=mobile

Thanks for the quick answer! +1 Accuracy

 

[Gunnertrones]

Well, there is an app or two on appstore. F.eks:
Chrono connect mobile pro (kr 39,-)
Chrono connect mobile lite (free)
Mr Dubber refered to this on youtube I remember.

Edit: Ah... 30 cal beat me there...