Question re: installing shouldered prefit

[catalyst81]

When installing a shouldered pre fit barrel, do any of you put anti-seize on the shoulder? I contacted Bighorn asking for torque specs (Origin action) for my 300 PRC, and they said they usually use 75 ft pounds and recommended some anti-seize on the shoulder of the barrel if I go any higher than that when I torque it down or I might shear the locating pin on the recoil lug.

I've been watching youtube installs and once or twice on videos I've watched they mentioned you want a metal to metal connection at the shoulder. It's my first experience with pre fits, so I'm a little nervous and want to make sure I do it right. I was considering 85 ft pounds with a little anti-seize on the shoulder (I assume Bighorn knows what they're talking about over some youtubers). I've read you want a little more for torque for magnums. Or would I be OK just using 75 ft pounds?

 

[Supersubes]

Anti-seize is always a good practice, and putting it on the shoulder will not hurt a thing. Torque it to 100 ft/lbs if you want(what I do). Doesn’t matter much. Ive never heard any rational for additional torque for magnums, although I’ve seen it on the info Zermat sends with the actions.

 

[andy52887]

On my tl3 I always did 80 and just put anti seize on the threads. Whatever gets on the shoulder from that point i went with it.

 

[padom]

I've torqued many hundreds of shouldered barrels on my multiple TL3's and Origin always to 75lbs with antisieze on threads. Not sure what you gain from going higher but never needed to.

 

[supercorndogs]

It probably will not seize on the shoulder, but using anti-seize on the shoulder lubricates the surfaces while you tighten them down.

 

[Steel head]

I use antisieze on my barrel tenons and a bit on the shoulder of the nut.

 

[kthomas]

I torque my barrels 75-100 ft-lbs, using a copper based anti-seize on the threads. As you screw the barrel into the action, some anti-seize will squeeze onto the shoulder. You don't need much anti-seize either, just a very light application.

 

[Hagen]

I use a little anti seize on threads and as kthomas said some will come out on shoulder. Have changed barrels on my origin several times and never used a torque wrench, just 1/2 inch drive ratchet cranked tight.

Probably in the minority on that but always shoots great.