I have never lubed wads when reloading shotgun shells. A lubed wad when shooting muzzle loaders will soften the residue left from the shot before so it's easier to push the next load components down the barrel. With a breech loader, or cartridge gun, that all becomes unnecessary. JMHO but I don't believe the extra weight of a lubed wad over a non lubed wad will make enough difference in pressure to be a problem.
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Paul Harm
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