Determining barrel contour?

[TheBigCountry]

How would one go about figuring out a barrel contour? Rifle is a 700 PSS, but the barrel is not stock (Marked GR Douglass XX 308 Win) and rather porky.

 

[Supersubes]

Its a premium douglas, installed by them. Here's a link to the contour chart. Just take some measurements and see which one it matches on the chart.

http://www.douglasbarrels.net/dimensions/index.html