Swamp refers to the profile of the barrels - wide at the breech, narrowing to a waist and then flaring some towards the muzzles.
flintlock longrifle barrels are a good example because the profile is more pronounced
look at the specs here -
http://ricebarrels.com/chart.html
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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