I'm also a bit curious about exactly what affects what in 12g setups. I'm working on getting my AM Illusion set up for stock class and the troubleshooting is a bit of a headache. Right now the first few shots will be high, but each following shot will go down about 10fps until it evens out around 230. Adjusting the velocity on these guns is a little different than a cocker though, much more finicky. Also the cold *** New England weather isn't helping.