Good move, Gary - I bow to Graeme's knowledge & experience on double guns, but I have compared 3f to 2F along with 1F GOEX in long cased .45 and .50 Sharps and that's merely GOEX, not the more powerful Swiss. I would use the 1 1/2F or 2f Swiss. 3f seems to work OK in the .45/70's short case, but rarely gives as fine accurqcy as the slower granulations.

140gr. of 3F GOEX in my .50 3-1/4" Sharps pierced primers, while 160gr. 2f GOEX didn't. The most accurate was 150gr. 1F GOEX, but I didn't have 2 barrels to regulate so could merely pick the most accurate load.

This reminds by the photo in Greener's book of a .450 BPE blown up with "fine Continental black powder.

Please don't use boiling hot water on those barrels, Gary. Cold water cleans BP fouling even more effectively and won't flash rust like hot water causes. Do use a good water displacing lube after drying it, though, like WD40, or Amsoil MP(Metal Protector - if they still make it), which was the best I've found. Can't find it now, so I use WD40, after drying and it's a good flush with a spray bottle, not merely a wipe. I buy the stuff by the gallon which is cheap - about $29.00 and that gallon lasts a year of shooting muzzleloaders at least once a week over the year.

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Daryl