I found a significant defect in the first WSM I bought. It was a Winchester M70 SS with crf in 7mm WSM. The chamber was way out of round!

Winchester overtightened the barrels into the actions on some and that made the chamber sag into the extractor cut they say.

I sold mine as the out of round chamber bothered me and it was not worth the bother. Also the rifle was not that accurate.

The Kimbers are much better actions. Their safeties work well and smooth. Not like those M70's.