1. You can size from 6.8 to .358 but i recommend a LEE 308 Win sizing die to less work harden the brass. 

2. Run the case through the 358 MGP sizing die ( I ONLY USE REDDING IMPERIAL SIZING DIE WAX)  a little goes a long way .

3. Chamfer and Deburr the case mouth.

*(Do not trim the case until after step 5)*

4. Fireform

5.Resize with the 358 MGP sizing Die.

6. Trim to 1.630" and you're Done.