When tubing a gun you need to go down two sizes for best results. So a 12 to 20 is fine. 16 to 28. 20 to .410. For certain bore sizes you can get away with dropping one size, but it's not optimal.
I use Briley for any full-length tubes. They custom fit the tubes for a specific bbl set. I also have them make the tubes with fixed chokes.
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