irish,

See my "break-in" post to gobuffs - It works!

I would suggest cleaning the bolt along with the rest of the gun - it will start to rust real fast if you don't. You'll come to realize that the primers are the most corrosive thing on the gun - unless you shoot true black powder.
Just FOLLOW KNIGHT's INSTRUCTIONS on how to take the bolt out. A friend with the .45cal DISC didn't, & ended up having to send it back to the factory to get it back together.

Persoanlly, I prefer the "natural" products for cleaning & prep. The T/C cleaner is fine (I use Simple Green & water), but I would lube the bore with bore butter before putting the breech back in. Just make sure that the bore has no residue of any type before applying the butter as it could seal in rust.

For powder & bullet choice: 150gr of powder usually shreds most sabots - start with 90gr & work up to 120gr, with 130gr max. I would look at bullets in the 300gr+ range. The Hornady 300XTPs work good as do 295 & 348gr Power Belts.
Powder pellets are easy to work with, but I've found that using the loose stuff allows a more custom load and if your gun decides it likes powder in 5gr increments (like my Knight USAK), then loose is the only way to go.