Dialing in a Barrel

[Alex Wheeler]

Proof barrels are about as straight as any. At least the ones I have chambered. Real easy to induce a bend in a barrel trying to force it into indication with common methods.

 

[Dusty Stevens]

That is not a machinist error and is common though not typicallly that bad. I don't think it had been brought up but I am planning to build a fixture that will go in the headstock to eliminate the outbound spiders and not induce any barrel bending.
Basically I am looking to take a very heavy wall pipe and add spiders about 6" apart in a rigid mount built to be used in my 4 jaw chuck. I will need to do some testing and see if it can be made rigid enough to support the bbl and keep any movement at zero. Basically to see if I can make it strong enough to be useful. Not my idea but I have seen it many times and am of tbe opinion if it works it could be the best way to chamber. Of course who hasn"t or doesn"t think that?

Sounds like youre wanting to make a fixture similar to the one the viper made commercially available. His has flush set screws to be a little safer and is a good tool to add for various tasks.

http://www.grizzly.com/products/Bullets-com-Viper-Chambering-Truing-Fixture/T10892

 

[butchlambert]

Sounds like youre wanting to make a fixture similar to the one the viper made commercially available. His has flush set screws to be a little safer and is a good tool to add for various tasks.

http://www.grizzly.com/products/Bullets-com-Viper-Chambering-Truing-Fixture/T10892

Not a new idea is it Dusty. I know Mike Bryant has had one for years. I think what the feller is looking at but doubt the barrel is bent. Bores can take off in any direction and certainly not an exact ellipse.

 

[Dusty Stevens]

Not a new idea is it Dusty. I know Mike Bryant has had one for years. I think what the feller is looking at but doubt the barrel is bent. Bores can take off in any direction and certainly not an exact ellipse.

Thats why i said he made it commercially available. I have one a guy made and used with my lathe that i bought 20yrs ago. Mine has huge 5/8 cap screws with copper wire tips. Its a death trap.

 

[butchlambert]

I built one quite some time ago, but bolted it to a face plate instead of holding it by the chuck jaws. I do know what you were saying.