Thanks for the input guys.
I was going to go with the guage but couldn't find one for a 7mm RSAUM.
I'm setting up a 7mm RSAUM on a Savage 300 WSM
action with a 27" varmit wt. douglass XX barrel.
I already own a 300 WM so really didn't want to go with a 7 mag but wanted a little more pop than a .280 without going AI. That pretty much left the 7 SAUM or 7 WSM so I went with the SAUM thinking if I don't like it I can have it punched out to a WSM relativly cheap.