This is an answer I got from Knight Rifle a long time ago when I asked them to tell me what my Knight Disc rifle would shoot well.

"We would use 100-150 grs. Of powder and a
250 to 300 gr barnes bullet to check accuracy..if this still does not
achieve accuracy ..."

The latter part of the e-mail simply stated that if the rifle does not shoot a 2-1/2 inch group at 100 yards, to let them know and they would check it. At the time I had just got my Disc rifle, wanted to mount a scope, so I had a lot of questions, and Knight had a lot of answers.