Hi, first post here. Having problems with HS-6 in my Interarms Virginian Dragoon 45LC. Loading HS-6 9.5gn over 250gn lrnfp, CCi 300 primers, OAL 1.565, new Starline brass. There seems to be unfired powder left in the brass that looks like brown flaky tumbling media. It's so bad it gums up the...