Barrel torque question

[Clark]

If you calculate the max torque on barrel threads it is something like 1000 ft lb.
If you measure group size vs tightening torque, the corner is low, something like 10 ft lb.
I put barrels on with 100 foot pounds, but almost anything would work.
I took off one rusty barrel with 560 foot pounds. I cleaned off the rust and put it back on to the same factory rotational mark. It was over 100 foot pounds.

 

[Ray Gross]

If you measure group size vs tightening torque, the corner is low, something like 10 ft lb.

Clark can I get you to expand on this a bit more? I don't understand this statement.

 

[dennisinaz]

I use Molycote Gn from Dow-corning on my Barrel threads. Very good stuff. I tighten to about 60 ft. Lbs. Never found more helps. The molycote greatly affects torque numbers. 60 ft lbs with Molycote will give you about the same amount of rotation as 80 with oil

 

[Clark]

Clark can I get you to expand on this a bit more? I don't understand this statement.

1) Go to the range with a loose barrel. Shoot a group. Tighten the barrel, shoot another group. Continue until groups get no smaller. The minimum torque for minimum group size was about 10 foot pound for me.

2) Maximum torque for a 1-14 grade 8 bolt is 995 foot pounds. This is similar to a barrel tenon threads.