Posted: 12/4/2012 1:01:11 PM EDT
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Which one of these look like it has the proper headspace for a .308/.260 barrel. That is a .308/.260/.243 Go Gauge in both.
Number 1: 
Number 2: 
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| No way to tell......headspace gauges measure from the boltface to the other datum point, the other datum point being the shoulder on a 308. You have to have the barrel torqued on the receiver to measure it. Having said that, they both look short for any firearm I've ever chambered. |
| The second one appears to be closer to headspace compared to the first. I imagine this is for a bolt with no protruding nose, like a savage-style bolt head. If you had a remington-style bolt head, the headspace gauge would be just about flush with the "second ring of steel". Typically, the rim, extractor groove, and a very small length of case protrude from the breech, like the second picture demonstrates. If the first were headspaced, it would likely have insufficient case support. I'd snap a picture of the barrel I just finished, but I've already torqued the action onto it and I wanna go home. : ) |
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Both Barrels are for an AI action. Number 1 is fubar.....which is the brand new barrel. Number 2 is correct. What kind if action? Are these prechambered barrels? Accuracy International AX. Number 2 is one of the mass chambered rifles that works across all AI rifles from the "factory". Number 1 was chambered by a custom smith without the rifle. Which is supposed to be an advantage of the AI action since they are all supposed to be within .001 of each other or something. |
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I bet that's SUPPOSED to be short chambered ......whoever installs it is supposed to finish chamber it. Unless an AI receiver is like a Savage, it would have to be since he didn't have the receiver. Nope. Was a fresh Barrel Blank. The smith just screwed the pooch. |
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The part about AI rifles being barreled without the action stems primarily from the fact that the action is bonded to the chassis- you can't test-fit the action on the threads or verify headspace without removing the barrel from the machine. Yep- headspace and other tolerances are indeed tight enough to make a barrel that will properly function without test-fitting. The real fun comes when someone wants a fluted barrel indexed without test-fitting. ; )
On the bright side, shallow headspace is an easier fix than the alternative! |