The expanse of brass is not a factor, I have purchased thousands of 30/06 cases for .07 cents each, I have paid .10 cents each for the good stuff. I was in North Carolina at a flea market when I found 1,400 cases for $14.00, that was .01 cent each. I should add, the cases were dirty and each case had a 30 caliber bee in them just a few days short of hatching. The wife was not too happy about the black cloud, the up side, wasp eat insects.
I have a 308 W forming die, it is my favorite, when I want 308 W cases I form them. When I form cases they fit the chamber, then there is the 'loose neck' thing. While forming I tighten the neck.
F. Guffey