Thanks for the advice guys. Charlie NC, I've also shot 180 gn and 165 gn Winchester factory loads with worse results than the Noslers.

I did a little work this week, and unless I hear back from a guy who wants to trade an RV for my old VW, I'm going shooting in the morning. I've gone through and scraped down the little bit of wood that might have been contacting the center of the action, found one suspect area in the forearm that might have been close enough to contact if the barrel whips (though I doubt it), lightened smoothed out the trigger just a bit (which I had intended to do eventually anyway) and removed more copper fouling than I expected to find from the barrel. We'll see if one or all of those things make a difference. Fingers crossed.