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The problem with using a Uniwad( I'm assumming that this is a plastic) is that unless an overpowder wad of somekind is used, a layer of plastic will build up iin the barrel.
In the course of a BP tarp competition , you will get greatly increased pressure in only ten shots!
We don't clean between shots as sometimes we are on a trail walk.
I use a card base wad, then a cusionwad from Ox-yoke, then an over shot wad, sealing the over shot with contact cememt so I don't have to work the brass with crimping.
60 grains of FFG and an equal volume of shot well under 7,000PSI.
You can get load data from several BP books.
Factory BP shells from Kent are about $10 a box of 25 , so I prefer to handload.
David
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