The rifle is a Remington Sendero SF II .300 UM w/ the HS precision stock that I am turning into a .338 Edge. I am more than likely going with a 30" Broughton 5C barrel. What is the largest contour that I can use with this stock? Also, recommendations on a muzzle break. I have read until my eyes bled trying to gain as much info I could before posting, and appreciate the help. The next question is on the Wyatt magazine box. I only plan on shooting the 300 grain bullets and am unsure weather to go with the CFE 9 ( OAL 4.00) or the CFE 12 (OAL 3.825). What can I get away with this stock and not have the gunsmith to upset fitting it. I am sure that i will have more questions down the road as this project progresses. Thanks in advance.