Its my impression that the cases last a long time when reloading the 300WSM, especially when loaded to moderate 30-06 type velocities.
Both the wsm and rsaum cases do seem to last a long time, from my somewhat limited experience. And not just with milder loads. I've seen some of each with 20+ firings. Heavy brass.
Of course, I've only loosened primer pockets on 3-4 '06 cases. I anneal after every 5th or so loading, and have only tossed just those few, which were likely my fault, trying to ramp things up too far. I do have a policy to keep shooting brass as long as it is fit. Any flaws and it goes into the moderate load, plinker circulation.
