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  #81  
Old 12-26-2012, 02:39 AM
TRICKSTER TRICKSTER is offline
 
Join Date: Oct 2009
Location: California
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StandardParts LLC has Forster 7.62 NATO gages.
https://www.standardpartsllc.com/pro...asp?message=83
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  #82  
Old 12-26-2012, 05:51 AM
nf1e nf1e is online now
 
Join Date: Apr 2012
Location: Connecticut
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Quote:
Originally Posted by Sailormilan2 View Post
I just got a set of Forster gauges from Brownells, and I ran into a similar issue as you regarding the 7.62 NO GO. I ordered a 308 FIELD, a 7.62 NATO NO GO, and a 7.62 NATO FIELD. What I got was:
243-308...FIELD..1.638
243-308............1.640
7.62 NATO........ 1.6455 MAX

Gauge #2 should have been marked 7.62 NATO NO GO. It has the right part number(100-010-715), but the label on the case says 243-308 NO GO GAUGE. But the gauge itself does not say what type of gauge it is, just the caliber and length.

I already have two Forster 308 gauges and they are marked:

243-308...GO.........1.630"
243-308...NO GO....1.134"

Both of these should be the proper markings for the 243-308, so I don't understand how the 7.62 NATO No GO could be labeled 243-308 1.640. From what I understand, the 1.640 is actually longer than 7.62 NATO NO GO, but shorter than 7.62 NATO REBUILD MAXIMUM GAUGE. I also think that the NATO FIELD gauge should be marked as FIELD, not "MAX".
I have written to Forster and am waiting a reply.
From all the guages I have collected over the years, .308 win field and 7.62 nato No/Go are the same. 1.640. At least when using Clymer guages as the reference point. Forster has used 1.638 as their field. Go figure. They are all close, but no cigar.
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  #83  
Old 12-26-2012, 10:57 AM
M14 M14 is offline
 
Join Date: Jul 2011
Location: south mississippi
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Quote:
Originally Posted by hmelect View Post
Okay here are the results of my new gauges. The bolt would close on a .308 go , it would close with a "pop" on the .308 no.go, it would not close on a .308 field gauge. It would close on a 7.62 go, it would not close on a 7.62 no go nor a field gauge. So I think I am good to.go for both 7.62 or .308. Right? Thanks Jim.
Yep, as Art said, you are good. Your headspace is somewhere between 1.6355 and 1.636 or so. See how that pop was as much as 1 1/2 to two thousandths now ? When it closed on the Winchester no go with a pop, you were actually forcing the metal to give in to your pressure from your fingers, as much as .002 Closing on the NATO go is a good indication of a fine headspace. It is only .0025 more than factory SAI's these days, and safe for both ammo types. I have seen lots of SAI's with 1.632 have problems with extraction and NATO ammo.

Shoot away bud !
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  #84  
Old 12-26-2012, 11:18 AM
M14 M14 is offline
 
Join Date: Jul 2011
Location: south mississippi
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Quote:
Originally Posted by Sailormilan2 View Post
I just got a set of Forster gauges from Brownells, and I ran into a similar issue as you regarding the 7.62 NO GO. I ordered a 308 FIELD, a 7.62 NATO NO GO, and a 7.62 NATO FIELD. What I got was:
243-308...FIELD..1.638
243-308............1.640
7.62 NATO........ 1.6455 MAX

Gauge #2 should have been marked 7.62 NATO NO GO. It has the right part number(100-010-715), but the label on the case says 243-308 NO GO GAUGE. But the gauge itself does not say what type of gauge it is, just the caliber and length.
Number two should have been marked SAAMI or WINCHESTER maximium. No go is either 1.634, or the older ones are 1.636 I already have two Forster 308 gauges and they are marked:

243-308...GO.........1.630"
243-308...NO GO....1.134"

Both of these should be the proper markings for the 243-308, so I don't understand how the 7.62 NATO No GO could be labeled 243-308 1.640.
Because they are confused, and confusing everyone else. I can assure you, the military is not cutting all their chambers for 7.62mm, longer by .0025 From what I understand, the 1.640 is actually longer than 7.62 NATO NO GO, but shorter than 7.62 NATO REBUILD MAXIMUM GAUGE. I also think that the NATO FIELD gauge should be marked as FIELD, not "MAX".
I have written to Forster and am waiting a reply.
The NATO gauge of 1.6455 is marked properly, it is max.
The field is actually 1.6375 for NATO, not 1.638.
the 1.638 gauge marked 243-308 field is to let you know that you are .002 away from max for SAAMI standards, and should think about getting ready to buy another barrel soon. It is a rebuild number or max rebuild. If it reaches this number, supposedly, it is time to rebuild. But I have never seen an M14, commercial or military, open up the headspace even one thousandths more. So you have quite a while until one that size ever does anything or sets back.
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  #85  
Old 12-26-2012, 01:54 PM
hmelect hmelect is offline
 
Join Date: Dec 2009
Location: Apopka, Florida
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Thanks for all of your input. I feel much better about shooting my new project and I learned something new in the process. Have a happy New Year! Jim.
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