Enfield-Rifles.com Homepage
Forum Home Forum Home > Enfields > Enfield Gunsmithing
  New Posts New Posts RSS Feed - Head space gauge
  FAQ FAQ  Forum Search   Events   Register Register  Login Login


Head space gauge

 Post Reply Post Reply
Author
Message
AbitNutz View Drop Down
Newbie
Newbie


Joined: October 30 2014
Location: Ohio USA
Status: Offline
Points: 19
Post Options Post Options   Thanks (0) Thanks(0)   Quote AbitNutz Quote  Post ReplyReply Direct Link To This Post Topic: Head space gauge
    Posted: October 23 2017 at 12:31pm
Are there any go-no-go gauges that are not SAAMI spec? I would really appreciate a set of gauges that are military dimensions. I have an expensive set of Forster gauges that are pretty much useless. I'm thinking of trying a field gauge but I suspect that may not work out either. 
Back to Top
Sponsored Links


Back to Top
Zed View Drop Down
Special Member
Special Member
Avatar
Donating Member

Joined: May 01 2012
Location: France
Status: Offline
Points: 2007
Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: October 24 2017 at 4:03am
http://www.okiegauges.com/


I have a full set of these for 303. They work well and not too expensive.
Worthwhile if you have more than one rifle or considering buying more!
It's nice to be important, but it's more important to be nice!
Back to Top
AbitNutz View Drop Down
Newbie
Newbie


Joined: October 30 2014
Location: Ohio USA
Status: Offline
Points: 19
Post Options Post Options   Thanks (0) Thanks(0)   Quote AbitNutz Quote  Post ReplyReply Direct Link To This Post Posted: October 24 2017 at 5:18am
I have seen those but they seem totally alien to what I'm used to. How are they to use? Can you give me a rundown of your technique? 
Back to Top
Shamu View Drop Down
Moderator Group
Moderator Group
Avatar
Logo Designer / Donating Member

Joined: April 25 2007
Location: MD, USA.
Status: Offline
Points: 7819
Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: October 24 2017 at 5:32am
I have the same set. They work fine on rimmed cases because only the rim matters for headspace.
My technique is:
Wip oil from gauge.
Remove magazine.
Open Bolt.
Point muzzle vertical.
Place gauge on bolt face. Make sure cut fits extractor.
Slowly close bolt with just one finger.
STOP the moment you feel resistance.
Open bolt.
Remove gauge.
Re oil.
Close bolt.
Ease springs.

PitBull, spawn of Rottie!
Back to Top
AbitNutz View Drop Down
Newbie
Newbie


Joined: October 30 2014
Location: Ohio USA
Status: Offline
Points: 19
Post Options Post Options   Thanks (0) Thanks(0)   Quote AbitNutz Quote  Post ReplyReply Direct Link To This Post Posted: October 24 2017 at 5:52am
So the difference in resistance between the go and no go gauges is it difficult to feel?
Back to Top
Bear43 View Drop Down
Special Member
Special Member
Avatar
Donating Member

Joined: August 11 2010
Location: Watertown, SD
Status: Online
Points: 1682
Post Options Post Options   Thanks (0) Thanks(0)   Quote Bear43 Quote  Post ReplyReply Direct Link To This Post Posted: October 24 2017 at 7:26am
Get the Okie gauges, you will love them. They are so easy to use and are mil-spec. I highly recommend them.
Back to Top
Shamu View Drop Down
Moderator Group
Moderator Group
Avatar
Logo Designer / Donating Member

Joined: April 25 2007
Location: MD, USA.
Status: Offline
Points: 7819
Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: October 24 2017 at 9:19am
There are 3 gauges in the set, one of which I doubt you'll ever use unless you're re-barreling.

"Headspace gauges generally come in 3 sizes:

http://www.okiegauges.com/images/set.jpg

GO <----> NO-GO < ----> FIELD

(One dimple) <> (Two dimples) <> (Three dimples)

   GO = 0.064"<------> NO-GO = 0.067" <> FIELD = 0.074".

GO: measures the minimum acceptable headspace. This size is most often used when re-barreling or re-chambering a firearm. The action should close on this gauge. It should NOT fully close on the other 2.

NO-GO: This gauge is used to check for excessive headspace. If a firearm closes on the NO-GO gauge it is an indication that the weapon MAY not be safe to fire. Reloading ammunition for a firearm that fails NO-GO can result in unsafe loads due in part to the expended brass being elongated as a result of not being firmly chambered. Most military surplus firearms that pass NO-GO (the bolt will not fully close on the gauge) are considered safe to fire with surplus ammunition, or with modem loads not intended for reloading.

FIELD: A firearm failing the NO-GO spec can be tested on the slightly more forgiving FIELD gauge. Military chamber specifications are generally looser than commercial firearms, giving them a bit of tolerance for adverse conditions such as dirty chambers, weather extremes, etc. A firearm passing FIELD spec (not closing fully on the gauge) is generally considered safe to fire the ammunition it was designed to fire, i.e. military surplus ammunition of the designated caliber."

You're not feeling for resistance, just contact. Its reduced because of the camming action as the bolt is closed so just that very first touch is what you want.


In reality you can probably get by with just the "0.074" "FIELD" gauge for most things as that was the only standard the British ever used.

In practice I bought the set of 3 & I use the "NO GO" first. If the action fails the "NO GO" by closing fully & double check with the "FIELD"
PitBull, spawn of Rottie!
Back to Top
AbitNutz View Drop Down
Newbie
Newbie


Joined: October 30 2014
Location: Ohio USA
Status: Offline
Points: 19
Post Options Post Options   Thanks (0) Thanks(0)   Quote AbitNutz Quote  Post ReplyReply Direct Link To This Post Posted: October 24 2017 at 10:23am
They're far and away cheaper than the traditional SAAMI gauges I'm familiar with so, like you, I ordered the set. We'll see if I'm smart enough to make them work.

I really appreciate the help.
Back to Top
Canuck View Drop Down
Special Member
Special Member
Avatar
Donating Member

Joined: January 17 2012
Location: Agassiz BC
Status: Offline
Points: 1911
Post Options Post Options   Thanks (0) Thanks(0)   Quote Canuck Quote  Post ReplyReply Direct Link To This Post Posted: October 24 2017 at 6:14pm
Great tools. I have two sets. One stays on my work bench the other comes with me to gun shows. Keep them well oiled, however, otherwise you might experience minute rust that could possibly throw off your measurement. This company who supplies these also supplies a striker depth of engagement (firing pin) gauge. This is a MUST tool in any LE owner's tool box IMHO. I know a person could use a depth gauge measurement using a caliper but....these gauges are just so neat. One thing I have found while using these gauges is that the gauge itself can slip loose after checking the head space upon disengagement and retraction of the bolt, so I use a magnetic tipped rod to extract the gauge. This helps with those 'oops' moments looking on the shop floor for the fallen gauge.   
Castles made of sand slip into the sea.....eventually
Back to Top
AbitNutz View Drop Down
Newbie
Newbie


Joined: October 30 2014
Location: Ohio USA
Status: Offline
Points: 19
Post Options Post Options   Thanks (0) Thanks(0)   Quote AbitNutz Quote  Post ReplyReply Direct Link To This Post Posted: October 24 2017 at 9:04pm
I have an Enfield NO4 mk1 that is in really pretty good shape. Out of curiosity, I decided to check the headspace.  The bolt will close even on my Forster SAAMI field gauge. Normally I would come unglued at this but I suspect it may be fine. I have come to the conclusion that these gauges when applied to Enfield rifles, are just about useless. 

I've yet to fire this rifle but intend to do so and see what the brass looks like afterward.
Back to Top
Shamu View Drop Down
Moderator Group
Moderator Group
Avatar
Logo Designer / Donating Member

Joined: April 25 2007
Location: MD, USA.
Status: Offline
Points: 7819
Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: October 25 2017 at 5:46am
Failing SAAMI but passing MOD WOPS is pretty normal.
PitBull, spawn of Rottie!
Back to Top
Bear43 View Drop Down
Special Member
Special Member
Avatar
Donating Member

Joined: August 11 2010
Location: Watertown, SD
Status: Online
Points: 1682
Post Options Post Options   Thanks (0) Thanks(0)   Quote Bear43 Quote  Post ReplyReply Direct Link To This Post Posted: October 25 2017 at 6:06am
The Forster field gauge measures .070" as opposed to the military spec of .074". That's quite a difference so failing the SAAMI and passing the other is very common.
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 11.05
Copyright ©2001-2016 Web Wiz Ltd.