re: Rem. 40X .244 threads - too nice not to share.

[Packrat1947]

I can not imagine trying to duplicate these threads. These are pre - '62; I believe.

The second photo is a 1981ish 40X repeater bbl.

 

[riflewoman]

Well, in the 20 years differential, production techniques for lots of products improved.

 

[Doug Beach]

So much for the myth that everything used to be better. No excuse for the first set of threads.

 

[Bocephus]

I can not imagine trying to duplicate these threads. These are pre - '62; I believe.

The second photo is a 1981ish 40X repeater bbl.
View attachment 1290277

Just chaulk #1 up to “first day on the job” OR the nephew of the CEO wanted to be a gunsmith.

 

[wk4036]

Well at least the force was against the good side of the thread

 

[matthias]

So much for the myth that everything used to be better. No excuse for the first set of threads.

Maybe its not that everything used to be better but the stuff that was good lasted longer?

Those threads are less than stellar

 

[FNSafari]

I can not imagine trying to duplicate these threads. These are pre - '62; I believe.

The second photo is a 1981ish 40X repeater bbl.
View attachment 1290277

Yuck to the old 40X

 

[dfrosch]

Looks like it made some noise when the threading insert hit that shoulder.

That's not a factory barrel, right? I would expect a little more stamping on a factory barrel.

 

[Packrat1947]

This is a factory take-off. The chrome-moly bbl. was sanded/polished to remove the scuffed up area where 8" was glued into the stock.

It sure looks like a die was used but I can't imagine how a die could cut like that. The second thread is pretty well formed, but at a different height. I'm clueless.

As an aside, many bbls would "come-alive" when glued in. Just like block bedding.

 

[acloco]

....somebody bumped the lateral and tried to recover. Close.....

 

[dfrosch]

Yeah, split lead with a single point thread insert. Crashed into the shoulder. Not die cut threads.

Don't ask how I know this.

 

[ronsatspokane]

Engaged the half nut on the wrong number.

 

[Flyshooter]

Yup, not a thread to tell your Mom about.....but I’ve seen some ugly barrel threads.
However, as long as the pitch remained true and the thread is not interrupted or excessively oversized/undersized there’s a great chance you’ll not see the difference on the target. Provided the shoulder cut is square........I could tell ya a couple of stories but that might inspire some dubious behavior.

If it torques up and head spaces .....it torques up and headspaces.....she may be pretty on the outside, but on the inside??

 

[jdh47]

How'd it shoot? Alex posted some pretty bad looking threads once and it was from a winning BR gun.

 

[Packrat1947]

Here's the throat from the Lyman borescope.

As an aside, Lyman has really good customer service. Kitty chewed through the wires of my first scope. I sent it back fully expecting to pay dearly for a repair. They didn't repair it but sent a brand new scope at no charge.

 

[SmokinJoe]

This may be poor machining, sure doesn't look too good, but back in the many cobwebs of my mind I'm thinking that maybe I saw something like this in an engineering text describing self-locking threads. Could this be an older design self-locking thread?

 

[boltfluter]

Someone missed, or used the wrong number on the lead screw dial! Maybe a Friday afternoon barrel.

Paul

 

[Old Navy]

Someone missed, or used the wrong number on the lead screw dial! Maybe a Friday afternoon barrel.

Paul

Or a Monday morning hangover.

 

[762willdo]

But how did it shoot?

 

[Will Henry]

If the barrel was threaded between centers (likely), the thread was nearly complete when the operator screwed up and hit the end of the thread. The dog slipped on the barrel a little and, when he went to make another pass, he split the thread. The tool was dull, the speed was too slow, and cutting oil may not have been used. Not pretty but it probably worked fine for years. WH