Shooting buckshot through a rifled barrel or through a barrel with anything tighter than an IC choke can, and often will, cause the pellets to smash into each other, causing a flattening of what started as a sphere. A sphere that experiences a flattening event will not fly true, causing the so-called "flyer." Flyers are bad. Shoot buckshot through a smooth bore with no tighter choke than Improved Cylinder if you want to produce a reliable and predictable pattern. If you don't care about that kind of stuff, go ahead, do whatchalike.
As for me, it's 00 buckshot in a smooth bore 18" 12 gauge. I know my house and what the pattern is going to be at the various distances in my house.
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