Home Forums Hunting & Shooting Gunsmithing Abolt rebarrel - shank thread?

I have a 14 year old Browning A bolt in 25-06 with a BOSS I am considering re-barreling. The throat seems to be going and the gun while still accurate has always been low velocity. One question I have is what is the barrel shank thread. If it is metric it complicates things a bit. My local gunsmith has trouble on his lathe with metrics. Can anyone here confirm the dimensions? Thanks

I believe this is right , but feel free to correct me if wrong

Browning A-bolt
Old: 15/16 x 20
New: 1' x 32

996 x 32 tpi and 922 x 20 tpi depending on the Age of your A-Bolt

At least they are English in either case

Browning changed the threads to 32 per inch to cut back on the SS Galling when removing are installing a SS barrel to the SS Action

And to increase the minor diameter of the thread to give a thicker chamber wall for WSM chambers. The same reason Winchester increased the tenon diameter on the Model 70. GD

Did Winchester do this to all their action or just the WSM?

They started with just the WSSMs and WSMs but ultimately, changed them all. They had some real problems with chambers which were oval when the barrel was torgued into the receivers which had the 1"x16tpi interupted thread. Hance the change to the 1 1/16x28 TPI thread. It only made sense to make all receivers the same to ease manufacturing set-up and this is what they did. Eliminating the interupted thread was a good move IMO. GD

thanks