This is one of those, What Calibre ? questions.

I have a (2nd) FN Mauser '98 action ready for another custom rifle project.
I want to fill the Ballistics hole between .243W and 9.3x62.

I'm thinking 6.5x65, .270, 7x57, 7x64, .30-06..

6.5x68 has been mentioned in another forum.

Use will be small/medium, antelope/deer, plains game.

What are your suggestions and why ?