I have had zero luck getting a good folded crimp on those hulls. It seemed odd, as I get far better results with the Cheddite 12ga. paper hulls.
For the 20s, I trimmed them to 2 1/2", 14.5 grains Alliante 20/28, SG20L wad, 3/4oz #8, and roll crimped them.
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