Kirk, William explained it pretty well. If you're reloading to max pressures then you'd want to stick to published loads. Most of us are fooling around at the low end of the scale. so there's room to play around a little. We're just telling you what works for us. All fiber wads in a load will have less pressure than the same load with plastic wads because the fiber doesn't seal as good. In old reloading manuals, when plastic wads were first used and all the data was for fiber wads, they said to reduce loads by 10% if using plastic. I'm not telling anyone else to do it, but I at times increase powder charges by 1 gr or so when subbing in fiber wads. JMHO
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Paul Harm
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