Yes there is a problem with all that space when using fiber wads and nitro powders. A fold crimp will help. Normally fiber wads have less pressure and velocity than plastic wads because they don't seal as well. The old reloading manuals use to say to use 10% less powder if going to plastic wads. You could also cut your shells down shorter than 2 1/2. I've loaded 2 3/8, 2 1/4, and even 2" shells. Some days I have too much time on my hands.
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Paul Harm
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