Have you shot any 88s with non bootleg brass? I wonder if the brass is causing you uncosidered/unseen issues? The case head separation would have me concerned about the headspace of the chamber but I'm sure you've done your due diligence.I think the good group this morning was just a statistical fluke.
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I shot again to see if there was a speed difference for @The Guide. There might be.
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I didn't pull and jam but I shot my 2.680 ammo and then some 2.650 ammo.
Take it with a grain of salt though because some of my brass is toast after this firing but the results line up with what I've been seeing all along.
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Its a kick in the pants because PVA is marketing their 22 creedmoor chamber to be superior and ideal for longer bullets and they cost a lot more than their competitors. I'm going to shoot some deer with these 88's and then finish the barrel with 77gr TMK.
Jay