Which is easier: necking up or necking down? I'm considering necking down .300 WSM to 7mm WSM or necking up .270 WSM to 7mm WSM. It's easier to find brass in these calibers. Also, would you recommend using reduced loads or cream of wheat for fireforming?
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General rule of thumb:
Necking down (making the neck smaller) is usually easier than necking up.
Necking up requires expanding the neck, which can cause more stress, potential splits, and requires better case annealing.
So in your example:
Necking down .300 WSM → 7mm WSM is usually easier.
Necking up .270 WSM → 7mm WSM is more work (though doable).