Go-No Go Gauge

[Old Navy]

I am getting ready to re-barrel my 6BRX. I am looking at .120" free bore to shoot the 105 Hybrid and 107 SMKs. I have had good luck jumping the Hybrids as much as .050" and staying out of the doughnut area. Can someone make an educated guess if .120" is enough. I don't have a clue what reamer was used on my current barrel and don't want to talk to the smith that did it. Am sure on a no turn neck and blue box Lapua brass. My new gunsmith asked that I buy a go and no-go gauge along with the reamer. I was under the impression that I only needed a go gauge? What is the difference between the two? Later! Frank

 

[Erik Cortina]

What is the difference between the two?

.005"

 

[Old Navy]

Do I need a no-go gauge? Thanks. Frank

 

[Jay Christopherson]

Do I need a no-go gauge? Thanks. Frank

If your smith is asking for one, then yes. Not all smith's use an "official" no-go gauge, but if that's his process and you plan to use him, doesn't seem like you have a choice. If he does things one way, and you start telling him to do it another, you probably won't be having a close relationship with your gunsmith...

 

[butchlambert]

Frank,
I have never bought a NO GO.

 

[hogpatrol]

+ 1 on Jay's post and I always buy both gauges. I want my chamber dead nuts to the reamer and it's cheap insurance.

 

[shortgrass]

+ 1 on Jay's post and I always buy both gauges. I want my chamber dead nuts to the reamer and it's cheap insurance.

+ another. He might work right there, next to the GO gauge, but as a matter of liability, he drops the NO-GO in, just for insurance. Like I've heard else where, "Murphy doe not discriminate!". If you're doing you're own work, do it any way you want,, if you're hiring someone to do the work for you .............. $30-$35 for an 'exra' gauge is cheap insurace, IMO.

 

[fguffey]

There were gages for chambers long before the Internet. One smith/author claimed he preferred purchasing chamber gages but knew smiths that made their own. I have an in-line/angle/butt grinder. It can be used to make pilots, tapered gages and head space gages. problem? The gages are fixed length like the go, no or beyond gage, I want to know the length of the chamber from the shoulder/datum to the bolt face. That puts me in the category of those that choose not to purchase factory made gages. I have head space gages, I use them for transfers and standards, I have access to 30+ head space gages. As long as I can make a comparator and keep up with datums I do not need a head space gage.

For years I thought head space gages came from Mars and made by Marshins, as in the gages were so precision they could not be made by humans, but head space gages are made by humans, I am a human, therefore I make head space gages. The smith/author discussed difference in materials when making gages, bumper/reloaders can bump the shoulder of a case .001”, by making a wild guestimate of a turn of the die, anyone that can do that can make chamber gages. Anyone that can drill a straight hole can make a comparator then there is that part about understanding how a comparator works.

F. Guffey

$30-$35 for an 'exra' gauge is cheap insurance, IMO.

Who tracks, the go-gage allows the bolt to close, the no go-gage does not allow the bolt to close, the owner of the rifle still has no clue what the chamber length is from the datum to the bolt face, the .proud owner only knows it is somewhere between go and no-go.

 

[butchlambert]

There were gages for chambers long before the Internet. One smith/author claimed he preferred purchasing chamber gages but knew smiths that made their own. I have an in-line/angle/butt grinder. It can be used to make pilots, tapered gages and head space gages. problem? The gages are fixed length like the go, no or beyond gage, I want to know the length of the chamber from the shoulder/datum to the bolt face. That puts me in the category of those that choose not to purchase factory made gages. I have head space gages, I use them for transfers and standards, I have access to 30+ head space gages. As long as I can make a comparator and keep up with datums I do not need a head space gage.

For years I thought head space gages came from Mars and made by Marshins, as in the gages were so precision they could not be made by humans, but head space gages are made by humans, I am a human, therefore I make head space gages. The smith/author discussed difference in materials when making gages, bumper/reloaders can bump the shoulder of a case .001”, by making a wild guestimate of a turn of the die, anyone that can do that can make chamber gages. Anyone that can drill a straight hole can make a comparator then there is that part about understanding how a comparator works.

F. Guffey

$30-$35 for an 'exra' gauge is cheap insurance, IMO.

Who tracks, the go-gage allows the bolt to close, the no go-gage does not allow the bolt to close, the owner of the rifle still has no clue what the chamber length is from the datum to the bolt face, the .proud owner only knows it is somewhere between go and no-go.

Well said Mr. Guffey.

 

[WayneShaw]

A go gauge and a simple piece of scotch tape will tell,you all you need to know.