In the bunch you listed, I’d definitely go 6.5 CM. Good factory ammo is available and you have a huge selection of high BC bullets available if you want to start playing at long range. Works well in a short action even with high BC bullets. If the 25/06 is a consideration, then consider the 6.5/06 too. There is NOTHING a 25/06 will do that a 6.5/06 won’t do better. Same with the 6.5x55.

I would rule out a 7mm/08 because reaching the lands is problematic with high BC bullets in a short action magazine. Would substitute 6mm Creedmoor for .243. Same ballistics but CM works better in a short action.

John

If my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then I will hear from heaven, and I will forgive their sin and will heal their land. 2 Chronicles 7:14