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Once fired brass?

If you are FL sizing Prolly 5 or 6. You will need to trim around 3rd firing. If you want to go over 6 you will need to trim again.
I am assuming max loads....why else have a WSM?

You might get case neck splitting but my experience has been primer pocket.

It is somewhat disconcerting to prime a piece of brass and have the primer fall into your lap.

You will know, the primer pocket and primer will be discolored.
 
I have 7wsm that's been loaded 12-15 times. I anneal every 3 firings to keep neck splits away. I full length size with a .0015" shoulder setback.
 
I've loaded some .308 cases 20 times and it's still good to go. I anneal my brass every time and only bump the shoulder .002. Your primer pockets will get too loose before the necks split unless you are really setting back the shoulders. Annealing is the key to getting long life from your brass to prevent work hardening.
 

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