Phil, I probably shouldn't say it, but in 12ga 15grs of anything is pretty safe. If one looks through all the different powder manufactures reloading handbooks, 15grs is a light load. The old manuals use to list everything for fiber wads and when plastic wads first came out they said to go down 10% if using plastic. That kind of tells you subbing in fiber for plastic will have lower pressures.
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Paul Harm
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