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That pattern difference is not because of barrel length but choke - not every barrel is the same, even if "choked" the same. With chokes measured in thousandths, even a .001 or .002 difference can make a difference. Also combining whether the choke has a nice long parallel section to keep the wad better stabilized, or the concentricity of the choke to the bore - along with many other minor details can make the difference. Just like metallic, some guns/barrels seem to have preferences for one type over another
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