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).
In my limited experience I prefer to neck down. I use Lapua .308 cases for my 7mm-08.
Might be even more helpful for you seeing as the 7WSM has the shoulder slightly forward of the 270&300WSM.
That is to say you can partially size your case, specifically the neck of the larger 300WSM, and only size enough to leave a false shoulder to aid in headspacing during fire forming.
Can 300 Savage brass be made from 250 Savage brass. I mean with little drama.
My experience says necking up is easier.
I have never done either. Why would you neck up or down instead of getting brass in the respective caliber.