Velocity Variations Between Firearms
Back when I was running the old Sixgunner website I got permission from J. Allan Jones (who then was the Editor for the Speer Reloading manuals) to publish the article that Dave Andrews wrote concerning velocity variations between different guns. Dave was the head ballistician for Speer at that time if I remember correctly.
Anyway, it's a short article and the data is interesting to say the least. It is now available on the Leverguns website if you have never read it.