These are new Bertram in a straight basic case. I was told this is the case to use to form 28 x 30 Stevens. 
I am selling these for a friend that used this basic case to form brass for a drillings he had with one barrel chambered for the 6.5x70R.  The dimensions of this straight basic case are,
length --- 2.821"
rim diameter --- .418"
head diameter --- .354"
diameter at mouth --- .350"
rim thickness --- .057"
I made these measurements with a dial caliper so may be off by half a thousandth either way.
There are two boxes of new brass but one box is missing one round so a total of 39 rounds of brass.
They are priced at $160.00 for 39 new cases.  I can ship all for $13.00
Please PM if interested.


Measuring an original UMC case, probably been fired more than once:
Rim  = .422
Rim Thickness = .057
Base = .356
Length = 2.488
Mouth = .308
Neck wall = .011-.012