I really like 5744 but you've discovered its shortfall... it's kinda nasty. I tried hotter primers but that didn't do it. A hotter load seems to help, but not solve, the problem. Breakfree Powderblast works pretty well on it... but so does carburetor/brake cleaner. My 1885 Winchester 45/70 loves 28.0gr behind a 500gr RNFPGC @ 25/1. About 1400fps.