Bertrams Australia headstamp
The last specimen was probably factory reloaded to Nitro, as can be seen by the spacing, the “NITRO” was added afterwards
Notice the very prominent ring crimp on the primer
As with the ELEY specimen above, the “NITRO” was added later when converted to NE loading
Norma prototype load from 470 NE case. Loads were tested in South Africa by Norma. Bullets by Ken Stewart and Woodleigh were tested. The tests included a buffalo hunt in Namibia(it’s cheaper than SA) and as a result the loads had to properly headstamped because of international travel regulations.