Stats Shooter
New member
Been some discussion on if the magnum really headspace on the belt
From talking to some gunsmiths, and my own experience, the answer is yes AND no. A factory loaded SAAMI spec round in my old chamber grew about .015 in length at the shoulder....And almost that amount if I FL sized the case all the way down until my base touched the die.
So when I neck sized Wich didn't really impact the shoulder, then it probably headspaced off the shoulder, and or at least it could have.But if the shoulder is .015 from the chamber max shoulder length, then it's headspaceing off the belt.
So essentially, if you are shooting factory ammo, or FL sizing back to SAAMI, then you are on the belt....If not, probably the shoulder.
My OP on this thread though arose because I'm doing my first Savage barrel swap with barrel nut and wanted to know how tight to make the bolt close on the go gauge.