[tobnpr]

Depends how good shooter you are... and how capable the rifle is, more so than the chambering, IMO.

Can you shoot well enough, to justify the lesser barrel life of the 6.5 x 284 over the .260, or 7-08?

Do you care about barrel life?

It's all a trade-off. Pushing more hot powder/gas through a smaller diameter throat is what erodes it. No free lunch here.

The general consensus I see these days, is that for most non-comp (and some comp as well) shooters, the .260 (or it's twin the 6.5 Creedmore) is pretty much "it", for a good compromise (although I choose 7-08)