I will say 308 since people are suggesting 7-08 and thats NOT what you asked about.
If its your gun only and you plan on reloading... go 257.
If you plan on handing it down to your kid that may not be a rifle looney or interested in reloading... then 243.
The 7-08 suggestion isnt bad because it lets you handle larger game.
I own a 708 and 308 and cant tell the recoil difference so I lean towards 308 because I am not a reloader (yet).
The ammunition shortage made finding 7-08 ammo a challenge and my father in law had a hard time finding ammo for his 257 roberts.
