Thanks guys for the excellent suggestions. I definitely should have a headspace gauge on my bench, and I will try to get one soon. As soon as you mentioned black fouling on the neck of the case, I thought "Yep, that's one other thing I observed but forgot to include in my original post." I aim to check the headspace, and then review the load for possible upward adjustment. I have chrono'd several of these rounds and it seems to be in the neighborhood of what Lyman's says.
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