I had a Knight Original Disc and it never let me down. I did try Blackhorn 209 on the range and had a few hang fires and give the rest of the can away. I hear you can drill out your BP and Blackhorn will work, but I stuck with Shockeys Gold, 120 grains under a Lightfield 300grain Bullet. My brother has a newer Knight with the red disc and his also works great. I don't think you could go wrong with either, but I don't think the red is any better than the orange, just my opinion. I have since sold my Knight to a guy I work with and he stayed with my set up and has had no problems. I went smokeless is why I sold it.