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COLUMNS DECEMBER 2009
 
     
HANDLOADING
John Barsness

 
Handloading To Change Shotgun Patterns
Change patterns at the breech end.
 
             
  HANDLOADING  
  Late-season pheasants usually demand tighter patterns. The handloads for this old
German drilling featured Lawrence Magnum copper-plated shot, a good choice for denser patterns.
 
                     
 

Many shotgunners apparently believe the choke, like gauge, is something exact and dependable. In fact very few shotgun manufacturers agree on exactly how much constriction of the bore makes, for instance, a modified choke.

I’ve measured a bunch of shotgun bores and chokes over the years and found 12-gauge “modified” chokes (whether fixed or screw-in) measured anywhere from .010" to .019" of constriction. While .010" of choke normally produces fairly wide patterns with lead-shot ammunition, .019" will often produce what are considered full-choke patterns (70 percent of the shot in a 30" circle at 40 yards).

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