Hmm, just found another helpful thread to my questions:
http://www.airsoftcanada.com/showthread.php?t=57181
Looking back now after a good night's sleep, the sudden realisation that I've just asked a question to which probably more than 75% of all posts on ASC are about trying to answer - hit me.
Nevertheless... if any of you have any comments on your own experience with your tightbores/twist barrels -eg. "my ___ tightbore/twistbarrel for my ___ gun seems to work reasonably well for me at this distance," or "I can usually hit my target on my 2nd shot from 10 paces" etc..etc. I would really appreciate it.

Thank you!