Handy link for fps/energy calculations

[SkruWD]

stumbled across this site, it's a pretty useful online calculator for what fps with what weight of bbs equates to in terms of energy, even gives you theoretical effective range, though i think the range one probably isn't as useful, seeing as how it ignores a whole lot of factors, including hop up and environmental factors (eg wind friction, gorse etc etc)

http://www.dpro.dk/Airsoft.int/calcfpsHmm.htm