Have to agree with BCB on the Unique. Never had much luck with it and don't care for the unburnt crap. Like in your other post, try some of the other powders in that burn range. SR4756, SR7625, WW231, WW Super Field, Longshot, AA#7,
HS7, ect.
The only Alliant powder I care for is STEEL in the shotgun. All the others seem to leave a bunch of crap in the bbl. I just tried some R15 in my 338 JDJ and same thing, bunch of crud in the bbl.