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Hehe, speaking of spitting BBs, Foxtail and Test_Tube used a TM loading rod and the field Chrony one day, got upwards of 300fps using .2g BBs. I've always found that putting your tongue on the opening and rapidly removing it yields blistering velocities (made a blow gun two years ago, 5/8" tubing, made some darts out of maple dowel, burned the tip and sharpened, was able to punch them through 1/4" 3ply birch plywood from across the basement, talk about straw in a tornado, eh?).
Assume maybe the rapid compression from using the tongue is on par with what Carl has said about the sudden compression that happens with a ported cylinder. Instead of an increase in pressure, it is just a sudden "POP!"
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