RE: Which Powder?
Holley
We do not have the best selection of powders in the world up here in the northwest where I am. We have the Pyro's and Triple 7 - I tried the Pyro's and did not like them and being that I think I am a performance nut I ended up using T7 right after it came out and have been using it every since. I hope you will be able to make the move to loose powder vs pellets. Pellets are very expensive and they are difficult to use to develop loads.... so if you can go loose - go loose.
I do shoot both 2f and 3f - for me it depends on the length of the barrel and/or if I am shooting a side hammer. If your Knight is a 26" or longer barrel and you are shooting 209's 2f will work fine.However, 3f does seem to burn a little cleaner and ignites reliably with #11 caps.
Some rifles do exhibit the "crud ring" ( a crusty ring deep in the barrel near where the bullet seats) a simple damp patch takes care of that in most cases.... for some reason I do not get these "crud rings" in any of my guns - not sure why there are a ton of different theories...
Anyway - I really do like T7...