With my BP reloads (12g and 16g) I just used an overshot card and then a ring of PVA glue (as in the above post). With my double barrels I never had the second barrel overshot wad jar loose (and have that unmistakeable sound of the shot running out of the barrel).
My cousin, who at the time was an excellent gun club shooter, used my 16g in one of our championship shoots and was up there with the 12g shooters. The skill level I'll admit made the difference.
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