I'm not educated enough to speak in Group Sizes but I prefer a chamber ~.75in wide and ~1.5 in deep.
These dimensions are one of my main considerations when I buy a pipe.
Hello All - Long time pipe smoker(ie: old coot)and ran across this forum a while back. Lots of good info here and I enjoy reading about everyones taste, preferences, etc.
Decided to join so I could throw my 2c in once in a while.