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you'll be much more happier with loose powder
As a Knight owner myself.... I say, go with Pyrodex 777 pellets.
I use 3 pellets =150gr of powder under a 250gr Shockwave works great and tight groups. Great Gun.
Powder sucks....You have to pour it out JUST right, or your bullet drops.God forbid you have to reload in the field, ON A WINDY DAY... lol....Pellets were designed and created for inline muzzle loaders, such as the Knight Bighorn.I have never had a miss fire because of powder.Pellets.
And for me, loose black powder is still something I respect very strongly, since a co-worker of mine was hospitalized because he used loose powder. All he did was turn a powder can upside down to empty it out, and BAM!3rd degree burns on half his body.Possibly static charge set it off, we don't know.I have never haerd of that happening with pellets. Just saying.A lot of us switched permanently to pellets after that.
Powder go with hodgdons 777 fffg and a 300 gr bloodline bullet. You can practice with grains from 80-120 but 100 is a good starting point. You may want to use cheaper bullets for sighting and practice.