I've always preferred the .264/6.5mm calibre.

But the .25s have vintage class.

The .25/06 used to be the sensible higher velocity choice.

The .257 is the 7x57 classic.

The .250/3000 used to once be a hotrod! A friend talked about getting one to match his .22/250 and add a .338 for an all round armoury.

Myself I might pick up a 10 round magazine .25/303 if a reasonable one ever crosses my path.