The photo below shows three .30-06 cases. The case in the centre appears to have a shoulder that istoo high and at a shallower angle than a usual .30-06. Is this something else fireformed from a .30-06 or am I just seeing things? The cantre case is the odd case, it is headstamped “F A 33”. The case on the left is a modern commercial round headstamped “F C 30-06 SPRG”. The round on the right is a lend-lease Remington headtamped “R A 41”. The shoulder difference can be seen in the photo. This looks like it would not chamber is a .30-06 chamber without alot of force on the bolt. If it is fireformed, why chamber something with so little difference in dimensions from a normal .30-06? What adavantage would it bring?