If I read that correctly, you’re doing a straight neck down to create a false shoulder, and using a cornmeal/CoW fireforming process, yes?
Would you happen to know the case capacity difference between the 6.5-06 AI and the Gibbs? What dies are you using for the Gibbs? I have one of my .30-06’s torn apart right now and have been strongly considering 6.5-06 AI, but I’m thinking the Gibbs looks to have a bit extra case capacity.