Remington 300 ultra barrel dimension

[D-mon]

hi,
I would like to have the following information please if somebody can help:
What is the outside barrel diameter on a Remington 700 sps in 300 Ultramag at the level of the beginning of the rifling( throat) ? I don't need a super accurate measurement but if one knows or could determine it for me that would be great.
Thanks
Nic.

 

[kendog]

It is most likely either a #5 or #6 Mag Sporter contour. This link should get you close...

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