Action won’t lock up on tenon shoulder

[Jperk0278]

Thanks to some of the great gunsmiths on here who’ve helped me along, I’ve so far completed 8 or 9 barreled actions for myself with great results.

However, I’ve got one in the lathe now that’s got a problem that I’ve been unable to figure out so hopefully, someone here has the answer.

This is a Defiance Deviant long action that measured .967 to the bolt face, so I cut the tenon to .962. The action threads onto the barrel beautifully until it gets close to the shoulder, where it binds up about 10 thousandths short when hand tightening. I’ve reduced the tenon length to .947 just to see if it would lock up, but it still binds up .010 short as shown in the pic.

This action initially locked up perfectly at .962, but I went too deep with the reamer and had to recut the tenon and now this is where I’m at.

Please advise what my next steps should be.

Thanks very much.

 

[Mulepackhunter]

theres not enough info here to answer well but roughly if you had to cut the shoulder you need to cut the nose dimensions as well. threads are probably binding in the bottom of the action. Im not up to date on the Anti action but i dont see a recoil lug there? If its integrated disreguard.

 

[Shanerbanner10]

It can only be a couple things:
Your threads od or id is too big/small
Your tennon is too long - remove material from the face of the tennon. If the tennon is too long the bolt should also be tight.
Thread relief is not deep enough on the back side (shoulder side) of the thread.
There are a couple other small things that could cause issues but those are your primary concerns.

 

[Tperry]

Kinda looks like your too tip radius is to large and it's causing it to bind up before it's all the way on. Either cut a relief groove at the shoulder or use a tool with a smaller tip radius.

This is assuming all of your dimensions are correct and your counter bore and all that are correct and not binding on the bolt.

 

[Rubicon Precision]

What are you doing at the tenon/shoulder junction? Runout groove, undercut?

 

[Smokin7s]

When you screw your action all the way on is your bolt still moving freely within the action?