From Bill Hanus's web site:


What we have here is a situation where we're pushing modern shotshell miracles -- from B&P, Federal, Fiocchi, Remington and Winchester -- through an arbitrary choke choice that was designed for shotguns with half-inch forcing cones, cardboard shells with fiber wads and chilled shot in use a hundred years ago!

Briley to the rescue! While it was still on the drawing board, BSA wisely decided to use the semi-standard Beretta threading for their choke tubes &endash; which meant that the BSA Royal model test gun was able to benefit from Briley's (800/331-5718) research and the development of their Diffusion™ choke tube (a skeet choke tube, cut with a one-turn-in-14" rifling). The idea is that the rifling imparts a spin to the shot as it goes through the tube en route to the bird. The following chart shows how the Briley Skeet ($35) and Diffusion™ ($55) choke tubes compare to the BSA factory Improved Cylinder chokes at 12- and 20-yard distances:


Pattern diameter (in inches) at:

12 Yards  20 Yards
BSA-supplied
Improved Cylinder choke
14"  22"
Briley Skeet choke
16 25
Briley Diffusion™ choke
17.5 29

On 12-yard birds, Skeet choke provides a 14% larger pattern; the Diffusion™ spreader tube, a 25% larger pattern. At 20 yards, the larger pattern bonuses remain pretty much the same -- about a 14% larger pattern with Skeet and a 31% larger pattern with the Diffusion™ spreader choke.

Write this down: you will take more birds with open chokes!

You and the 12 Yard bird - Part I

The spreader is a 20 yard choke. MIKE.