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School me on reforming brass, please.

Never reformed brass before, but I am reloading a few different rounds. I have a 7mm RSAUM and need to know what type of die I need to use to form 300 RSAUM to 7mm on an RCBS rockchucker press.
 
Just use your 7mm sizing die. Use a good,Imperial, etc.) lube. You can use your seater as an intermediate step if you wish. Trim after forming.
 
Just run them into your 7mm SAUM full length die, and keep adjusting it down until you can feel a tiny bit of resistance when you close the bolt, then tighten down the lock ring.
You'll need to remove the firing pin assembly to feel it.
They will probably need the necks turned down, depending on the chamber....
 

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