Hey Wombat, that's interesting. Can't be the short barrels (your Searcy is 24 inch?), because I get no unburnt powder using AR2213 in my 24"-barrel Jeffery .400, clean as a whistle. My .470 burns clean too. The .500 NE Vic used to have left no unburnt powder with IMR4831 either.

Fed 215 primers all round, I assume. Are you using full-weight bullets?

I haven't 'graduated' to 'short cut' 2213 yet. When the writing was on the wall, I bought a couple of 4-kilo cans of the old 2213. The new stuff is a tad slower I believe. Perhaps that's it, although unburnt AR2209 is a concern.

Mate, you gotta do what's best in your own gun, of course.