Gene beggs on chambering

[JerrySharrett]

Barrels made by reputable makers over the last 30 years have the OD ground to very close tolerances to the bore. I want to see the bore that "worms" its way through a barrel.

Mount a barrel where the breech and the muzzle bores are true and turn the spindle on and LOOK!!!


GEECH!!!


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[wallyw]

Mount a barrel where the breech and the muzzle bores are true and turn the spindle on and LOOK!!!


GEECH!!!


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What are you seeing? 20 - 30 thousands runout? If I measured more than 3 thousands the barrel would go back.

 

[Butch Lambert]

Barrels made by reputable makers over the last 30 years have the OD ground to very close tolerances to the bore. I want to see the bore that "worms" its way through a barrel.

Who told you that and by the way, what is close?
If you are chambering in the headstock, what difference does .030" matter?

 

[Richard]

your going

to be sending ALOT of barrels back if you can't live with more than .003 Actually, it really doesn't make much difference. I have seen straight bbls be dogs and crooked bbls be dogs. Seen it be just the opposite also. Best way to qualify a barrel? Shoot the darn thing!

Richard

 

[JerrySharrett]

to be sending ALOT of barrels back if you can't live with more than .003 Actually, it really doesn't make much difference. I have seen straight bbls be dogs and crooked bbls be dogs. Seen it be just the opposite also. Best way to qualify a barrel? Shoot the darn thing!

Richard

I've seen some crooked barrels shoot better than nearly straight ones.

Note. I did not say straight ones...there ain't such an animal!


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[Dave Tooley]

How do you measure internal run out in a 27" barrel blank? I know there are laser systems that can do it but no mechanical systems.

 

[Richard]

Pretty easy

scribe a line the length of the bbl. Cut bbl into 1" sections then measure Just yanking somebody's chain

Richard

 

[skeetlee]

The closest barrel to being straight I have ever worked on was a Brux barrel. On the same token, the most crooked barrel ive ever seen was a Brux. I don't know how the straight Brux barrel shot, but the crooked one was a lazer!! Go figure!! Lee

 

[JerrySharrett]

How do you measure internal run out in a 27" barrel blank? I know there are laser systems that can do it but no mechanical systems.

I use 29" blanks. When I cut off approx. 5" from the muzzle and approx. 2.5" from the breech. After setting the barrel up to chamber and closely indicating the ID, I run an indicator off the OD on both ends. I have seen as much as 0.007" of inconcentricity.

Then I spin the barrel and look down the spinning bore. When it looks like the old high school 2-girls jump rope, I call it crooked and note it in that barrels written history. Doesn't seem to be any relationship I have found in the performance of an almost straight barrel over a very crooked one....but, 0.003" max and send it back? The shipping costs alone would be prohibitive.


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