Actually, the "correct" fit for a paintball-barrel match veries gun to gun. For instance on low pressure guns like the shocker, cocker, etc. You want a pretty tight fit. The only exception to this rule is the timmy. Because the timmy design creates a vortex to cushion the ball in the barrel so you want a size larger than the "ideal" Now the blow test (no sucking) basically tests how well a ball fits through the barrel to prevent random spin and chopping. Basically you do this on spot at the field since the temp. and humidity vary from your home to the field and balls change size. Basically you put a ball in the sleave than try to blow it out. It if comes out with a nice puff of breath, its a good fit. With a proper match, the freak can be a dream. Without one, it's just a damned nightmare. Good Luck.
