[North East Redneck]

I use 777 FFFG in everything from my .22 NAA revolver to my 12 Gauge Traditions break action shotgun. Use it in the .44 revlovers, the .50 inline, the .50 sidelock and the .54 sidelock. It works as long as you load properly for the gun.
As to one hole groups, why not? My '51s, '58s and ROA are great shooters. I can shoot them with great accuracy at ranges to 100+ feet. If I shot them more, I'm sure they would still be more accurate @ 100 yards than I can be. I have some FFg pyrodex, haven't tried it yet. The FFFg works fine. Powder is scarce, and can be very expensive around here. I make what I can get work.