I have a Kibler SMR in 45. I use a 445 ball and 0.015 patch. Shoots excellent. Tried 440 ball and 0.015 patch, and it did not do well.
200+ shots no misfires. I used french amber and black english flints. They last a long time.
I dont clean between shots. I have a green mountain barrel, and I lapped it when new. It is like glass, E Z to load and clean.

Put on a barrel mount peep sight, and larger front sight. Original sights suck in my opinion.