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There is nothing wrong with flat primers. When they flow into the surrounding groove, you have a problem.

Winchester used to make high quality nickeled primers, up to about 10 years ago. Some batches of the non-nickeled were so soft that they allowed bypass, essentially putting divots in the faces of bolts. Folks that didn't catch it in time had a circle of divots in the bolt face. Not just M14 bolts, but those of bolt action rifles as well.

As I recall, TonyBen found out the hard way.

I swore off Winchester primers at that point. There are better options.
I ran into this a few years ago as well, did damage to the bolt face of a Mauser I had. Contacted Winchester and they took back all the primers I had of that LOT # and replaced them. They were aware of the issue and fixed it.
I have heard of no further issues.
I still use Win primers all the time in my bolt or lever guns, but in most cases for my semi's I use CCI or 210Match Federals.
 
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