The pics speak for themselves. These are 30-06 cases most are stamped LC 62 MATCH
bullet is .316 or so
case length 2.475
shoulder angle is really weird.
Could this be 8mm-06 or a Gibbs or Ackley wildcat?
The only provenance that I have is that it was purchased as part of a larger ammo lot from the City of Tucson AZ surplus auction. At first glance it looks like a 30-06 round that I accidentally crushed in my press, but there is 50 of them exactly the same.
I took a shot next to a regular 30-06 round.