This would then be a couse of an oversized bullet?
Taking one of the osr rifles and slugging it to compare with the bullets that is blamed would reveil it then, woulnt it?
Or in worst case a standard load on a harder bullet that becomes an severe overload do to the bullet construction, it would also be easy to test.
Either none has tested or there must be more to it, either way its interesting.

In the good old days severe overpressure from cordite would have been quite normal in hotter condition, why isnt there plenty of records from burst/osr barrels.

btw, beeing in germany have you ever seen a barrel on a combo ruined by "hard" bullets?