Also if I shoot a 200 Gr. bullet at around 3200 to 3250 f/s which is still fast for a 200 gr. bullet will that burn out a barrel just as quick as a 180 at 3400 f/s
I don't know if there is a solid answer for this. You are trading bearing surface for speed. Pressure remains the same, but your powder load is lower with the 200. And pressure and heat is what craps the throat out. I bet it would be a toss up. Good question. Maybe someone else knows the true answer.
I got a 26.5" barrel. 30" would be my limit. After that I don't think you would be able to get much more velocity.
Your right, when I had this 2nd 300RUM factory gun, I didn't mind burning it out either cause I couldn't wait to get a match barrel. The factory barrel copper fouled real bad. And it drove me nuts. So I understand where you are coming from. Good luck either way.