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What would be the pattern difference between a cylinder bore choke and a modified choke at 15-20 yards shooting 2 3/4" #00 BUCKSHOT?
 

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The cylinder choke might perform better than the modified choke at 20 yards. Tighter chokes deform buckshot coming out of the barrel, causing a few of the shot to go off the target. I would say you will get 6 of the 9, #00 buckshot in a pizza box at 20 yards with 2 3/4" shell. There are 15, #00 pellets in a 3" Winchester Super shell. You really need to find your own pizza box and try it on your own.
 

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30"+ circle at up to 25 meters. Don't go tighter than Modified with anything larger than #4 Buck.
 

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If you're using the shotgun as a pure defense weapon, a straight cylinder bore choke is hard to beat.
 

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You would really need to pattern the ammo you select out of the barrel you have to see how it performs. Also a cyl bore can pattern pretty well with some of the newer was designs like Federal Flite Control wads, or Hornady TiteWad.
 

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The newer shells have shot cups and buffering to protect the shot form the choke. My 20 gauge double is choked Improved and Modified. 20 pellet #3 buck patterns 5" I and 4" M at 7 yards while my cylinder 12 gauge patterns 6" with 9 pellet 00 buck at 7 yards. With cylinder you can expect approximately 1" per yard.
 
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