1.060" barrel in 1.075" action

[APGE]

How'd folks,

I have a remington 700 action that has been blueprinted and when it was done, the action thread opened up to 1.075". I have acquired a prechambered, unfired barrel from another rifle that headspaces fine, but has a normal 1.060" tenon.

Is it safe to fire this?

When installing the barrel it is a little loose, but snugs up quite fine.

Cheerio,
Alex

 

[GenePoole]

According to Machinery's Handbook, the major diameter max for a 3B class internal 1.0625x16 thread is 1.0768, and the min major diameter for a 3A external thread is 1.0531, so in theory, this is a class 3 fit. How do you know the action is 1.075? If you are sure that is accurate, then you should be fine.

 

[DaveTooley]

Pitch diameter is determining factor and we don't know that for either the barrel or the action. Any comparison would be pure speculation.

 

[carlsbad]

Pitch diameter for a class 3 1.062x16 external thread is 1.017-1.021.
Pitch diameter for a class 3 1.062 x 16 internal thread is 1.021 to 1.026
pitch diameter for a class 3 1.075 x 16 internal thread is 1.034-1.040

This would be very sloppy fit. the threads are deep by .013 to .014. I wouldn't use it.

--Jerry

 

[chet]

Pitch diameter for a class 3 1.062x16 external thread is 1.017-1.021.
Pitch diameter for a class 3 1.062 x 16 internal thread is 1.021 to 1.026
pitch diameter for a class 3 1.075 x 16 internal thread is 1.034-1.040

This would be very sloppy fit. the threads are deep by .013 to .014. I wouldn't use it.

--Jerry

as Carlsbad said. sloppy fit, would never be stable when shooting, heat would make it shoot erratic.

chet

 

[ROCKJAG4]

as Carlsbad said. sloppy fit, would never be stable when shooting, heat would make it shoot erratic.

chet

TRY THE DAMN THING. IF IT DON'T SHOOT, USE IT FOR A TOMATO STICK.

 

[carlsbad]

Actually I'm not saying it wouldn't shoot. A tight thread fit isn't what keeps a barrel centered. I like my threads loose--toward the outside of the specs quoted above--but still within them.

I'm saying that the joint is significantly below design strength. Remington has a lot of margin in the design. So it probably won't fail, especially with a small caliber round. If you're thinking of a magnum, please don't try it.

But even with a low energy round, you've significantly reduced the margin designed into the joint.

--Jerry

 

[Ggmac]

To those of you that say shoot it , sign a liability form for the OP . For those of you that know better , good for you . Somehow a bolt 4" into your skull is a good reminder why you should be cautious.

 

[Dusty Stevens]

I wouldnt shoot it. Just cause it screws in doesnt mean it fits in the first place. It needs to be fit to that action. If the threads are opened up everything else is too

 

[Ggmac]

I probably should add a liability form signed for the shooters on each side of the shooter

 

[shortgrass]

To those of you that say shoot it , sign a liability form for the OP . For those of you that know better , good for you . Somehow a bolt 4" into your skull is a good reminder why you should be cautious.

Or a barrel 'launched' down range with all the gas, brass, and debris coming back in your face. Every time a primer ignites a powder charge in a cartridge the is a "tug of war" between the barrel and the action, only thwarted by that connecting thread. Think long and hard about that!

 

[APGE]

Thanks for all the replies gentlemen. I have decided not to used the barrel

Cheerio,
Alex