So I'm planning a custom rifle and need to figure out a contour that is neither too heavy or too light. I'm planning a .308 build, with a barrel length of 20". I'm going to get it threaded 9/16" x 24, so the minimum barrel diameter at 20" has to be .662." I've looked at barrel contour charts until I'm cross eyed and can't figure it out. I think its close to a Remington standard sporter profile because it looks like a #2 is too light and a #3 is a bit too heavy. Any help would be appreciated.