These are made from 308LC 1x fired brass. These have the base reduced by machining .004 off the base. Nothing really to be alarmed about since the Mil brass is real thick to begin with. These will be about 10gr heavier since the brass is thicker. So don’t load these using max load data, work up your loads. And the primer crimp has been removed and they are annealed.
The necks do get reamed on these as well.
Of course with the thicker brass being used there’s the advantage of a very durable case.