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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 05-23-2019, 12:50 PM
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Default Is a perfectly sized case as good as a Go gauge?

I have a collection of No-Go gauges. I just realized I don't buy Go gauges as Ive always used sized cases.

Is that a no go? (pun intended)
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Old 05-23-2019, 1:41 PM
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I've only come across one rifle that was actually "short chambered", it was a 308 AR upper from JSE Surplus. They said they don't use gages either....
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Old 05-23-2019, 7:30 PM
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No. That will only tell you that you size cases smaller than the chamber youíre putting them in.

But if youíre verifying that you sized the case at maximum allowable dimension rather than at a smaller but within tolerance dimension then ok, itís still not as precise as the go gauge.

But if youíre the one shooting and only your reloaded / resized ammo... why care what a go gauge says?


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  #4  
Old 05-23-2019, 7:33 PM
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I have been reloading since 1968 and never had or used a gauge.
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Old 05-23-2019, 7:42 PM
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I have only built one rifle so far but I had asked about gauges during the building process and from the responses I got the consensus was that if you are using quality parts you should not have a problem. But then again, I am still a noob.
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Old 05-23-2019, 11:03 PM
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Quote:
Originally Posted by MarikinaMan View Post
I have a collection of No-Go gauges. I just realized I don't buy Go gauges as Ive always used sized cases.
How do you know where your cases are sized?
What "perfect" standard are they sized to match?

The standard is a GO gauge.
If you don't have one, you probably can't zero your case comparator very accurately to even know IF your cases ARE sized perfectly.
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Old 05-24-2019, 5:49 AM
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Quote:
Originally Posted by CaliforniaCowboy View Post
I had asked about gauges during the building process and from the responses I got the consensus was that if you are using quality parts you should not have a problem.
That is true only with the AR15 (5.56) where standards are well defined on barrels, exensions, and bolts. Any other rifle, you need GO & No GO gauges.
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Old 05-24-2019, 8:23 AM
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Quote:
Originally Posted by CaliforniaCowboy View Post
I had asked about gauges during the building process and from the responses I got the consensus was that if you are using quality parts you should not have a problem.
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Originally Posted by smoothy8500 View Post
That is true only with the AR15 (5.56) where standards are well defined on barrels, exensions, and bolts.
Only partially true.
There are lots of AR-15 parts that are out of spec.
It's especially common when people use bolts with plating other than just parkerizing.

"Consensus" amongst unqualified opinion givers is a dangerous thing because it's often wrong.
How did you qualify who you were accepting opinions from and who you were rejecting opinions from?
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Old 05-24-2019, 9:31 AM
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Quote:
Originally Posted by ar15barrels View Post
Only partially true.
There are lots of AR-15 parts that are out of spec.
It's especially common when people use bolts with plating other than just parkerizing.

"Consensus" amongst unqualified opinion givers is a dangerous thing because it's often wrong.
How did you qualify who you were accepting opinions from and who you were rejecting opinions from?
I did not reject any opinions, As I recall, all the calgunners that chimed in said I should be good without.
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Old 05-24-2019, 9:37 AM
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Quote:
Originally Posted by ar15barrels View Post
How do you know where your cases are sized?
What "perfect" standard are they sized to match?

The standard is a GO gauge.
If you don't have one, you probably can't zero your case comparator very accurately to even know IF your cases ARE sized perfectly.
AND, a sized brass case likely won't have the flat, smooth shoulder at the datum line like a properly machined GO gage.
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  #11  
Old 05-24-2019, 9:43 AM
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FIFY


Quote:
Originally Posted by CaliforniaCowboy View Post
I have only built one rifle so far but I had asked about gauges during the building process and from the responses I got the consensus was that if you are using quality parts you might not have a problem. But then again, I am still a noob.
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Old 05-24-2019, 10:22 AM
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No. Buy the correct tool for the job, or pay someone to do the work.
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Old 05-24-2019, 10:24 AM
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Quote:
Originally Posted by MarikinaMan View Post
Is a perfectly sized case as good as a Go gauge?
How do you verify that it is perfectly sized?
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  #14  
Old 05-24-2019, 2:19 PM
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Quote:
Originally Posted by smoothy8500 View Post
That is true only with the AR15 (5.56) where standards are well defined on barrels, exensions, and bolts.
Quote:
Originally Posted by ar15barrels View Post
It's especially common when people use bolts with plating other than just parkerizing.
Yeah, I forgot about those AR15 bolts a few years back getting the Nickel Boron plating and were way out of spec...
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  #15  
Old 05-24-2019, 2:38 PM
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Quote:
Originally Posted by jimmykan View Post
How do you verify that it is perfectly sized?
With a case gauge.

I can buy a Go gauge. My thought was that the Go gauge was used to check if a new rifle will chamber without using a live round. That’s what I use it for. Which is why I assumed a sized case would suffice.

Is there another reason besides that? If there is, I’d appreciate the knowledge.

Last edited by MarikinaMan; 05-24-2019 at 2:57 PM..
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  #16  
Old 05-24-2019, 2:56 PM
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Quote:
Originally Posted by MarikinaMan View Post
With a case gauge.
I don't know that the case gages are meant to register the HS datum line on the shoulder.

Have you put a NO GO gage in a case gage? If so, how far out did the base project?
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Old 05-24-2019, 3:05 PM
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I did a bit more research. I built my ARs and checking used guns I buy. I’m not reaming chambers or anything like that.

I’m guessing some of those chiming in have use for the Go gauge that is more advanced than my purposes.
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Old 05-24-2019, 3:51 PM
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If you are using just a case. You are only checking to see if the case will chamber.
This does not check headspace.
That's what the go-nogo guages are for. These guages use the datum line on the nose to measure from there to the headstamp.

Just using a case never touches the front where the datum line in the chamber. Is located.

Are you confusing case guage with go-nogo guages ??
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  #19  
Old 05-24-2019, 6:27 PM
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This is entirely my fault. I should’ve said what I use the No-Go gauge for.

I use it only to perform checks on used rifles Im going to buy and new ones I put together. If a used gun doesn’t pass the no-go, I pass. I chamber a sized case for guns I put together, and check with the No-Go as well. I also check my competition rifles with the No-Go and, sometimes, Field gauges when they see a bunch of use.

I do not think I need to check the datum, zero a comparator, or any of that other stuff for what I need them for.

Am I wrong there?
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  #20  
Old 05-24-2019, 6:46 PM
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Quote:
Originally Posted by MarikinaMan View Post
With a case gauge.

I can buy a Go gauge. My thought was that the Go gauge was used to check if a new rifle will chamber without using a live round. Thatís what I use it for. Which is why I assumed a sized case would suffice.

Is there another reason besides that? If there is, Iíd appreciate the knowledge.
How do you verify your case gauge is right?
Hint: many are not.
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  #21  
Old 05-24-2019, 6:50 PM
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Quote:
Originally Posted by ar15barrels View Post
How do you verify your case gauge is right?
Hint: many are not.
Good point. I donít know. I will need to check it. Thanks.
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  #22  
Old 05-24-2019, 6:52 PM
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Quote:
Originally Posted by MarikinaMan View Post
This is entirely my fault. I should’ve said what I use the No-Go gauge for.

I use it only to perform checks on used rifles Im going to buy and new ones I put together. If a used gun doesn’t pass the no-go, I pass. I chamber a sized case for guns I put together, and check with the No-Go as well. I also check my competition rifles with the No-Go and, sometimes, Field gauges when they see a bunch of use.

I do not think I need to check the datum, zero a comparator, or any of that other stuff for what I need them for.

Am I wrong there?
Of all the gauges made, the Go gauge is probably the least useful for people who are not cutting chambers and fixing headspace in guns.
A No-Go tells you if a gun is worn past what a new gun is allowed to be.
A Field tells you if a gun is worn beyond the point where it's no longer safe to fire.
A Go gauge only shows you if the gun will accept ALL ammo that is made to the specs that the Go gauge follows.

Where a Go gauge is most useful is when you are building guns.

Most Go gauges are made to check the absolute minimum chamber length dimension.
That dimension ALSO happens to be the ammo maximum length dimension.
The reasoning is that any gun that will accept a Go gauge would then accept ammo that is within the accepted standard dimensions.
New guns should be checked with a Go and a No-Go to be sure they are within spec before being fired.
There are often combinations of parts that will all infividually be in-spec, but the final assembled gun can be out of spec.
Using both gauges catches this before a problem pops up in live fire.

A Go gauge is also very handy for checking case gauges and is a very handy datum to check your case measuring tools against.
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Last edited by ar15barrels; 05-24-2019 at 6:55 PM..
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