When he said paint-to-barrel match he meant if the bore size properly fitted the barrel. To test this out stick the paintball in the back of the barrel, when it is unscrewed from the gun, and you should be able to blow on the barrel and it should come out. If it rolls out, the paint is to small, if your cheeks turn purple, its to big. Their is a video on Webdog that covers this.
Low Resolution Video (1.8 Meg):
http://www.webdogradio.us/video/tipclip/WDR11.wmv
High Resolution Video (5.3 Meg):
http://www.webdogradio.us/video/tipclip/WDR11hi.wmv
-Mike