View Full Version : FYI, Clymer measurements.

March 26, 2002, 12:59

FYI, I just received an email From Clymer in regards to the 7.62X51 GO, NO-GO, and FIELD gauges dimensions. Here’s what they sent me:

Go 7.62x51 NATO = 1.633
NG 7.62x51 NATO = 1.639
Field 7.62x51 NATO = 1.643
Datum = .400

Here’s what I found in the search function:

1.630" Forster GO
1.630" Winchester .308 minimum
1.6315" NATO 7.62 minimum
1.632" Clymer GO
1.634" Forster NO-GO
1.636" Clymer NO-GO
1.638" Forster FIELD
1.638" Winchester .308 maximum
1.640" Clymer FIELD
1.640" NATO 7.62 maximum

And… here is my question:

1: Why the difference in the Clymer numbers (especially the NO-GO and FIELD) from what we’ve seen on the board and what Clymer states? Could it be a difference in the Datum?



Tango 1Zero
March 26, 2002, 20:56
I forget who makes the one Bushmaster sells?
I saw it on here before but cant locate it.


March 26, 2002, 23:17
I think the ones that bushmaster now sells is the Forster line but I could be mistaken.


March 27, 2002, 08:06
apples to oranges, clymer spec'ed 7.62x51 not .308 there are differences.
.308 go=1.630 7.62go=1.633
.308 nogo=1.634 7.62 nogo=1.639

.308 and 7.62 are spec'ed differently because of the military need to be able to fire shots in extremly varying conditions, and ammo coming from all over the world, plus in a time of war specs tend to become looser as machinerey wears out and cannot be replaced. and above mentioned specs also have a tolerance field of .001 of an inch on gages. HTH