Checking headspace

[GeorgeandSugar]

Get the go and no-go gauges. Better safe than sorry.


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[mustangfreek]

Get the go and no-go gauges. Better safe than sorry.

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Your not new, but first post...welcome kinda sorta......Your comment got my brain thinking....

No this won’t turn into the 2 page thread/replies like someone here.......

But say you’ve got a 308/762 match/hybrid chamber of the sorts.. One would use the 762 guages?

Or am I overthink this? In the past when I didn’t have guages I’d set up a few dummy rounds at the datum line number and use them ( well to the closes I could)recheck after to make sure they didn’t push in etc... But don’t have the means to do that with 308 stuff.. I could throw in a 308 and 762 rd and pull firing pin.....and see if it closes etc....

And no ive never had a single ar not be in spec or have problems of the sort...

[GeorgeandSugar]

Your not new, but first post...welcome kinda sorta......Your comment got my brain thinking....

No this won’t turn into the 2 page thread/replies like someone here.......

But say you’ve got a 308/762 match/hybrid chamber of the sorts.. One would use the 762 guages?

Or am I overthink this? In the past when I didn’t have guages I’d set up a few dummy rounds at the datum line number and use them ( well to the closes I could)recheck after to make sure they didn’t push in etc... But don’t have the means to do that with 308 stuff.. I could throw in a 308 and 762 rd and pull firing pin.....and see if it closes etc....

And no ive never had a single ar not be in spec or have problems of the sort...

This should help. Check 308 forum.

Pacific Tool and Gauge offers three lengths of headspace gauges per rifle caliber. In order from the shortest to longest, they are: GO, NO-GO, and FIELD:

GO: Corresponds to the minimum chamber dimensions. If a rifle closes on a GO gauge, the chamber will accept ammunition that is made to SAAMI’s maximum specifications. The GO gauge is essential for checking a newly-reamed chamber in order to ensure a tight, accurate and safe chamber that will accept SAAMI maximum ammo. Although the GO gauge is necessary for a gunsmith or armorer, it usually has fewer applications for the collector or surplus firearms purchaser.
NO-GO: Corresponds to the maximum headspace Forster recommends for gunsmiths chambering new, bolt action rifles. This is NOT a SAAMI-maximum measurement. If a rifle closes on a NO-GO gauge, it may still be within SAAMI specifications or it may have excessive headspace. To determine if there is excessive headspace, the chamber should then be checked with a FIELD gauge. The NO-GO gauge is a valuable tool for checking a newly-reamed chamber in order to ensure a tight and accurate chamber.
FIELD: Corresponds to the longest safe headspace. If a rifle closes on a FIELD gauge, its chamber is dangerously close to, or longer than, SAAMI’s specified maximum chamber size. If chamber headspace is excessive, the gun should be taken out of service until it has been inspected and repaired by a competent gunsmith. FIELD gauges are slightly shorter than the SAAMI maximum in order to give a small safety margin.

http://pacifictoolandgauge.com/saami...-go-field.html

https://forum.308ar.com/topic/1865-g...uage-question/


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