OK, here it goes.

I have this old Remington (Enfield design) 1917 bolt action, 30-06. The bore is junk, so I'm going to build a new rifle with a little help from a gunsmith friend. I'm going to by a sporter weight barrel for it. I do NOT need another rifle, I have pretty much everything I need and then some for what I hunt. (This rifle is not complete, so don't say "sell the enfield and buy a new one,", it's only worth about a hundred bucks the way it is)

I have a ;
300 Win.Mag, bolt
.308, bolt
7.62x39, semi-auto
.243, bolt
.223 AR15
.223 single action
several .22 rim fire and shotguns of assorted gauges.

So.....I want something in between the .300 mag and .243 besides the .308. I don't want anything bigger caliber than .308. I need to stick with brass that will fit the bolt face of the 30-06 size. So 30-06, .280, .270, etc......

I wouldn't mind something A LITTLE BIT exotic, but not too much. I want to be able to get brass/bullets without spending a fortune or being a pain.

So, what are you all going to talk me into??