The conundrum -
6 vs 6.5
Both good choices with many good bullets to choose.
Barrel life and factory ammo vary.
How much speed do you need will determine powder capacity.
To trim or not determines shape.
A standard 243 gets a lot of work done. The AI and the similar 260 and CM in 6.5 have niceties.
In the end, a good rifleman will enjoy and be successful with any of these above mentioned if they do their job.
Me, I shoot the 47 but like the CM and 260 a lot as I do the 243.
A 243AI has one downside IMO, bore life. Yet one has to pay to play
