My pattern testing of pattern performance, i.e. choke, has been in line with the Briley table. That was of course conducted with modern plastic shot cups and hardened shot.
The three tables are not far apart and with a change in components or even guns, all could certainly produce the pattern densities as listed.
Please remember that barrel constrictions as commonly referred to as "chokes", are not only the overall constriction but also the angle of compression. The shot column flows through the constriction and accelerates when squeezed as water does through a nozzle on a garden hose. Smaller shot would seem to flow through a smaller hole than the bore easier than would larger shot. That difference may affect a pattern.
The barrel constrictions of classic shotguns such as Parkers and LC Smiths were usually 3" or more in total length. Modern "chokes" have an inch or so of total constriction to achieve the same effect. Yes, today we have plastic shot cups and hardened shot that allow sharper angles of constriction to work properly. My point is that given constriction may not be the same from gun to gun.
Last edited by MarkOue; 12/11/11 07:34 AM.
