I really like Swiss...when I can get more I'll use nothing else, so in the meantime I use what I've got in my flinters.
Grain for grain, in my guns, ffg Swiss seems to be about equal to fffg Goex, power wise. I don't really "compensate" for the extra ooomph...I shoot the same charges in my guns that I would with Goex. 110 grains in both the .62" and .75", and 90-100 grains in the .58".
I use ffg in my .75" and .62", and have tried it in my .58", and will eventually use it in that. In these big boys the fg granulations just don't seem to work as they should in theory, not even in the .75"....so I'm not sure what would be gained by using 1f or 1.5f in a .45", .50", .54" etc. In my guns, ffg seems to work fine for everything.
I find Swiss to be very accurate and almost as clean burning as 777, and probably cleaner than Pyrodex...been a while since I've shot Pyrodex though.
By the way, just for no reason I stoked my Navy Remington up with ffg Swiss one day, and groups shrunk from 2.5" to 1.5"...!! In that situation, the load felt a bit "soft" compared to fffg Goex...but wow, the accuracy was sure there!
Rat