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Old December 26, 2019, 06:21 PM   #177
P Flados
Senior Member
Join Date: January 8, 2017
Location: Wilmington NC
Posts: 115

Take some of your hotter "as fired" rounds and roll them across a flat surface looking for wobble on the base.

If the base is out of true, you could be having a problem with either the bolt or the barrel extension.

If there is no wobble, the base is square and the lockup of the gun is probably good. If the lockup is good, bad brass would be the only explanation for uneven compression in the groove region.

I am really scratching my head looking for something that we missed.

While loading, as there any chance at all that you could have either gotten a wrong powder (Lilgun, H110), or gotten some "wrong powder" mixed in with your 1680?
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