Here's the simple OAC check for both of my 30/06's of each bullet I'll be using.
The straw will keep it lined up as I can feed the cleaning rod threw the straw too make sure that each bullet of "different weights" is just touching the lands.
I'll keep the test bullets too check for throat wear at the 2500 round count too see how the barrels are fairing.
Most of the completion F Class folks rebarrel at that stage.
Neet little tricks of keeping track of stuff.
I'll do the split case OAC as well since the numbers should pretty match up if the bullets seat too the lands correctly.
I'll run the cleaning rod down the barrel too mark it when up against the bolt face, then the bullet.
The 2 marks in between are the OAC of where the lands touch the bullet,,, then I'll set the bullet 5 too 10 thousand's off the lands,,, 20 for the Harvesting rounds.
Don at getting up too speed on what will hopefully improve things down range.