I started loading my 10 gauge with BP and had them same issue with not filling up the shell. It didn't affect the loads ability to send the shot down range but like Paul said it does make sealing a little harder. When I put 2 half inch fiber wads on top of the over powder wad I did get a perceived increase in pressure AND it tightened up my pattern considerably. I submitted an article about all to the Parker Pages so it may get published. I am a fan of shooting BP. Good luck
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