Can I get some information on this?

[RCS]

The 300 Savage was an excellent cartridge when introduced in 1920 in the Savage Model 99. The 300 Savage was also tested by US Ordnance at the end of WW2 and over time became the 7,62x51mm NATO.

In my photo: 300 Savage, 300 Savage FA 46, FA 48, FA 49, FA 50,Attachment 80818 FA 52 and FA 54 AP

The cartridge becomes longer and with different angles on the neck