Ok, I know a poor mans crono is an aluminum coke can. But how far away should you stand? What penetration is what fps roughly? If it doesn't Peirce it at point blank is it safe to say fps is under 250???
Load up the gun to be chronoed with some .20-gram bbs. If you use .25-gram BBs your results will be flawed; Ill explain later. Now align the muzzle of your gun 1-2 inches from the surface of the can, any closer or further, and your results will be off. If you are shooting through the side or sides of the can simply stand it up on a level surface. If you are shooting at either the top or bottom of the can, lay it on its side. Lastly, do not hold the can, this messes up your results too,
In order to accurately gauge your velocity, your shot must pass through the target are of the can in one shot; if it doesnt, youll need a new can. Near breakthroughs and "It almost went through!" won't cut it here, that BB has to be on the other side of the target.
There are six ranges of penetration on a Coke can. In order of difficulty they are:
One Side .290+FPS
Both Sides ..340+FPS
Bottom Center 385+FPS*
Bottom Edge ...450+FPS
Top Center ..470+FPS
Top Edge 500+FPS
So from that I would say any gun incapable of completely penetrating at least one side following the correct procedure would be under 290 FPS.
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Originally Posted by Knief
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