View Full Version : First Headspacing Try, is this correct?

March 24, 2002, 00:01
Ok guys I know I'm probably beating a dead horse here but this is the first time I've set headspace on a FAL and I just want somebody to doublecheck me.

New Imbel receiver.
Dans Grade III kit.
Forster GO & NO GO Gauges

Starting with a clean chamber and bolt (no extractor) this is what I found;

Go Gauge 1.6300"
.261" Closes easy
.263" Closes with light to moderate pressure
.265" Won't close

No Go Gauge 1.6340"
.257" Closes easy
.259" Closes with moderate pressure
.261" Won't close

So to be safe to shoot .308 and/or 7.62 Nato I should use a locking shoulder of .263" or maybe a .264".

Is my thinking correct??


March 24, 2002, 00:29
according to your post a .264 LS would give you 1.631 HS if you allow .001 for set back after firing. i would suggest .263=1.632, .262=1.633, .261= 1.634 but here i get confused you stated that no-go gage would not close on .261, this doesn't compute, because your findings indicate .261 should = HS of 1.634 the bolt should close on a no-go gage using .261 pin, please recheck to make sure your numbers are right. to be safe.HTH

March 24, 2002, 00:53
By your calculations,

Go Gauge 1.6300"
.261" Closes easy = Best choice for NATO ammo reliabilty. But a little sloppy for my taste.

.263" Closes with light to moderate pressure = Best choice for acheiving overall accuracy with both 7.62x51mm and 308Win. ammo. After .001-.002 set back, this will give you the tightest headspace and still remain as reliable as .261 setting. The first 20-40 rounds may chamber tightly until set back has occured..

.262 would be like ringing the dinner bell at a Lobster fest :D :D

March 24, 2002, 00:53
Thanks for the reply.
I rechecked the numbers and my original post is correct.
The NO GO will not close on the .261" pin.
? ? ? ?

Rich, thanks for your reply also, I'm partial to lobster myself!
Somebody pass the butter!


[ March 24, 2002: Message edited by: Mouse ]

March 24, 2002, 20:00
Your numbers look fine, in fact they are right on for a rifle in perfect spec according to original design specs.

I'll second Rich's recommendation.

For best reliability with all ammo and adverse conditions: .261 LS

For better accuracy: .263 LS

But I'd just go for the Lobsters.