On the subject of forgotten cartridges...
Almost all of the original Mannlicher cartridges is having a re-birth. 6.5x54MS, 8x56MS, 9x56MS and the 9,5x57MS. I use all of them to hunt anything from springbuck to Eland.
Then don't forget the .22 Hornet! the perfect round to teach the young to shoot, and I'm using mine to collect the tiny 10! Deadly up to 150m and almost no carcass damage on the small critters.
Then my personal favourite... the 300H&H
seems that none of the main brand rifle makers make them any more! Manage to pick up a Voere in 300H&H as well as and old Musgrave single shot target rifle. Both deadly and IMHO better than the newer 300 magnums! Nothing feeds as smooth as a 300H&H cartridge, and there is just that nostalgic look and feel about the cartridge.