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I would think that you need to find out exactly what your headspace is. I invested in a complete set of match gages several years ago and am glad for it.
The cartridge headspace of that ammo you are shooting is prob. 1.630-maximum. Your chamber headspace with component bolt could be 1.635, 1.636, or 1.637, fact is you just don't know.
I am not surprised the brass is stretching that much given that the probable cartridge headspace is @ 1.630 or less and your chamber headspace is almost .308 field reject.
What does the rifle's headspace tag say it is? If you bought a new SAI rifle, it should have had one.
The cartridge headspace of that ammo you are shooting is prob. 1.630-maximum. Your chamber headspace with component bolt could be 1.635, 1.636, or 1.637, fact is you just don't know.
I am not surprised the brass is stretching that much given that the probable cartridge headspace is @ 1.630 or less and your chamber headspace is almost .308 field reject.
What does the rifle's headspace tag say it is? If you bought a new SAI rifle, it should have had one.