I have decided to rebarrel my 243WSSM to a 6.5/25WSSM. Now I need to figure out the best way to load for it. I had a couple of ideas. I am planning on using the sinclair expander mandrel to neck up from 25 to 6.5. Then: 1. Forster Ultra micrometer seater and full length sizing die set in 25wssm and send it to Forster to open up to the proper diameter and put in a .264 expander. 2.Redding Type-S full length sizing die in 25 wssm and getting the proper bushing. What size bushing do I need or what diameter should I specify? What diameter would work best to open up the seating die to? Chamber is a .303 neck, so I figure a loaded round should be .300 o.d. at the neck. Would .297 bushing do it for the sizer?