We cannot make proper advice/recommendation(s) other than what has been provided, if you cannot provide us with the right information; as you can see with some of the responses. We have lots of members here with tons of experiences that are always willing and able to help but it is hard to guess what you truly want or need.
Your rifle (barrel) must work in harmony with your suppressor to get the best result. Consult with your reputable gunsmith, barrel source, and suppressor source for your project; I did exactly all of these along with custom reamer and reloading dies maker before starting my parts acquisition for my upcoming project. Sorry but I don't think I can make it any simpler than that. lightbulb
Good luck!
I was trying to figure out how many inches of barrel I'd have to reach .600" diameter on the contour I linked. That contour actually was the wrong one but the correct one will not get me there either. I was simply screwing up the math and was wanting some help with it, that's all. I've got the equation figured out to where my figures match Edd's. I'm not at the point where I need to start contacting anybody yet.