I have not personally shot one. I have handled them in a store and was very impressed.

I'm a big fan of the Knight platform and like the Disc line. No doubt, it will shoot well with the Green Mountain barrel. The Kevlar stock allows function with less weight.

I believe the Ultralite has the bare primer holder as a standard feature. I suggest you try the Winchester 209 primers as they are the longest and will provide the best seal to prevent blowback in the breech. I also suggest BH 209 but all powders will shoot well with the proper swabbing between shots.

Enjoy the new rifle. It will last a lifetime with proper care and cleaning.