Go-gauge question

[saunaking]

For all you gunsmiths out there:
I ordered a go- gauge for a reamer that is based off a 6BR that will make it an improved case with a 40 degree shoulder. The go-gauge that was sent from the reamer manufacturer has a 30 degree shoulder. When I called to question whether this was the correct gauge for me, I was transfered to the "shop foreman" who told me that they make all their AI go-gauges to the configuration of the parent cartridge. He said this was the way P.O. Ackley did all of them, and was necessary to make sure I got the .004 crush. Is he blowing smoke up my ass, or is this what you would use for any Ackley Improved chamber? I am not a gunsmith, but don't see how this can work for head-spacing properly.

Thanks

 

[jdh47]

Here is an article from the Clymer catalogue about AI chambers.

http://www.clymertool.com/catalogue/ClymerCatalogueVol11.pdf



Joe

 

[Dusty Stevens]

It is that way so you can still shoot the parent ctg safely in there

 

[JRS]

It is that way so you can still shoot the parent ctg safely in there

+1 It's the way P.O. Ackley designed it.

The JGS go gauge for my 6.5x55 BJAI is a standard 6.5x55 go gauge. For my 257 Weatherby, a standard 300 Win mag go gauge.

 

[saunaking]

Thanks guys,
I don't have a standard 6BR go gauge, so I couldn't measure to see if there was a difference in their lengths to the datum line. What is the standard length to the datum line for a standard 6BR go-gauge? My measurement to the datum line on this go-gauge is 1.075ish.

 

[kendog]

Thanks guys,
I don't have a standard 6BR go gauge, so I couldn't measure to see if there was a difference in their lengths to the datum line. What is the standard length to the datum line for a standard 6BR go-gauge? My measurement to the datum line on this go-gauge is 1.075ish.

My drawing says 1.670" at .350" diameter. Same for all BR chambers.