When I arrived at the range this morning it was very humid. (I always have a problem with 4f on a humid day with my Flinters. I needed to fill my brass primer and decided to put 1/3- 3f and 1/3- 4f. I left enough room for some air and shook the powder round to make it mix. It seemed to work way better with that mixture than straight 4f. I have used just 3f in the past when it's humid and thought this may help. If any others would like to try it and give a report that would be GREAT.