Well, it's getting closer to cutting chips. I'm going to try for as light as possible and going all titanium this time. Tube is 1.625 O.D. with a thin wall of .054 thick. I've sketched out a basic 60* cone for this and I'm curious on ya'lls thoughts.

The tube is Grade 9 and the baffles and end caps are Grade 5. I'm not clipping the cones as that has shown to adversely affect accuracy with the 300BLK.

Also, if you notice how the internal cone dimension turned out, I think I'll try and cheat with a 1.25 inch, 6 flute 60* counter sink.