at the end of the day, my eblade has been set up by Nicky T @ planet so im sure the gun is right, and works fine with a halo, but not with an egg. it doesnt stutter like some people say theirs do, it just doesnt go any faster than 11bps
as for timing it, shoot the gun over a decent chronograph and it will give you a bps readout (possibly not totally acreate, but a good starting place)