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Posted: 8/15/2010 3:10:29 PM EDT
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I am building a 338 federal ar10 upper. I purchased a dpms 338 federal barrel and mounted it on an armalite ar10 upper. I broke out my trusty forester 308 go and nogo headspace guages. I inserted the nogo and with an extra little push I was able to get the bolt to close on it... crap....
So I break out one of my armalite ar10 rifles just to see how it headspaces and it closes with even less effort on the nogo guage. I checked my other 2 armalite ar10 factory built rifles and checked them (one of them is an ar10T) and they all close on my nogo guage. What gives? one of these rifles only has like 200 rounds through it, none of which where hot or anything. When I built FAL's they all headspaced perfectly when I chose the right locking shoulder. All of these ar10's function flawlessly, am I missing something? |
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I had a Remington 700 in .223 that I had bought used from a guy who had rechambered it from its' original .222.
Before I fired it I took it to a very well-known (National Champion) Palma/NMC HighPower rifleman who did most of his own gun work to have him check it out for me. The bolt did close with some pressure on his NoGo gage, but he indicated that it was still plenty tight enough to be safe with factory ammo. (I'm sure he would never have put that in writing and signed it), but he wasn't at all concerned about it and told me that a lot of perfectly good guns would fail that test. I fired it thousands of times after that and never had any issues with it whatsoever. When I reloaded for it I always neck-sized with a Lee Collet Die and bumped the shoulder every few loadings with a FL die as necessary to chamber it without having to go all Neanderthal on the bolt handle. Brass life was great. YMMV |
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Quoted:
<snip>with an extra little push<snip> I think you answered your own question. Once you feel resistance with the gauge, you stop. It doesn't matter how far the bolt is from closing, just as long as it doesn't. You may have just trashed that gauge. The extra push could have just squashed the gauge, time to hit Brownells for a gauge set. 
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Quoted:
Quoted:
<snip>with an extra little push<snip> I think you answered your own question. Once you feel resistance with the gauge, you stop. It doesn't matter how far the bolt is from closing, just as long as it doesn't. You may have just trashed that gauge. The extra push could have just squashed the gauge, time to hit Brownells for a gauge set.
When I say a little extra push I really mean a little, like switched to a thumb instead of my index finger to push the back of the bolt carrier a smidge. I cannot imagine that smashing an A2 tool steel headspace gauge, am I wrong? |
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Quoted: Quoted: Quoted: <snip>with an extra little push<snip> I think you answered your own question. Once you feel resistance with the gauge, you stop. It doesn't matter how far the bolt is from closing, just as long as it doesn't. You may have just trashed that gauge. The extra push could have just squashed the gauge, time to hit Brownells for a gauge set. When I say a little extra push I really mean a little, like switched to a thumb instead of my index finger to push the back of the bolt carrier a smidge. I cannot imagine that smashing an A2 tool steel headspace gauge, am I wrong? How much do you think .003" is? ETA: I think the gun is probably safe to fire. But you want to be pretty careful with headspace gauges. You don't drop or smash your micrometers, and they're a precision tool just like the gauge is. |
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