Best Choke for Buckshot

Thanks for answering that. I have a 870Supermag that I was cleaning the other day; I thought "wow those are some long forcing cones". I've never patterned it with buck, but I might just have to.:D
 
"Wad stripper" chokes like the PatternMaster and others of the type, defeat the purpose of Federal's Flite-Control wad.

And some other loads too. I tried my then-favorite Estate SWAT 00 load through the Patternmaster a few times, with less than satisfactory results. This load had a very deep one-piece shot cup and a lot of buffering between pellets. They'd string patterns about 4" wide and 24" long at 25 yards, and tilted in unpredictable directions to boot. Seemed to me the shot cup wouldn't leave the choke evenly, and would scatter the shot in a long narrow pattern as a result.

lpl
 
High muzzle pressure...

...can ruin patterns! Heavy loads combined with short barrels can exhibit high muzzle pressure which in turn can distort the gas seal causing the wad release shot unevenly.

I have tested heavy buckshot loads that would pattern tightly from a 26" barrel and blow patterns with a 20" barrel using the same load and choke tube. The culprit was excessive muzzle pressure unevenly flaring the wad gas seal causing the wad to tip or yaw on exit.
 
...can ruin patterns! Heavy loads combined with short barrels can exhibit high muzzle pressure which in turn can distort the gas seal causing the wad release shot unevenly.

I have tested heavy buckshot loads that would pattern tightly from a 26" barrel and blow patterns with a 20" barrel using the same load and choke tube. The culprit was excessive muzzle pressure unevenly flaring the wad gas seal causing the wad to tip or yaw on exit.
That being said, I've never shot any low recoil shells of any kind out of my shotguns, but would low recoil buckshot hold tighter patterns, due to lesser pressures? Very curious to find out this info.
 
"...would low recoil buckshot hold tighter patterns, due to lesser pressures?"

Not neccessarily. For example 9 pellets of 00B run 1 1/8th ounce. Full power and reduced velocity 1 1/8th ounce loads will both use fast burning powders resulting in relatively low muzzle pressure even in 18" barrels.
 
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I use 3.5" shells for turkey hunting, usually the first shot followed by 3" shells. And those aren't buckshot, more like #4 lead.

I only use 2.75" buckshot shells and those for home defense.
 
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