I am a fan of the Coated bullets, but can not compared them to shotgun barrels.
They do not have lands and grooves. Smooth bores are easy to clean. Acetone, say in home made Eds Red cleans out any plastic residue. Probably would work on any trace of coatings.
Last trip to the range I shoot several hundred coated 9mms. Cleanup was maybe 2 patches with CLP and a brush. Normally 6 or more.
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Still Running Against the Wind
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