Yeah, 260 Rem if you want some factory rifle choices. Fewer in the 6.5x55. Both good rounds, IMO. Not sure if anyone is still chambering the 6.5 Rem Mag; maybe Rem in the Mod 673, or???
It wouldn't be too awfully painful to pick up your favorite make of rifle from the used gun rack in any '06 based chambering and rebarrel to 6.5-06 or 6.5-284, and then you have something a little different.
The 6.5's have quite a history (even in Africa) and if you research them you may be quite impressed. It may not help make up your mind, but interesting reading. Some of the long range shooters seem to like the 260AI.I'm sure it has been discussed over and over but for some reason i have been intrigued but the 6.5 caliber for some time now. And now i'm contemplating about buying one. Any suggestions about which one? Pros and cons?
magnumitis
I think you will find that unless you are only wanting to shoot single shot, you will find the 6.5x284 is going to take a long action. I built mine from a model 700 and the OAL with heavier bullets, my measurements showed them to be too long to feed into the magazine on a short action. I know the benchrest guys use the short action but they are using it single shot. Then again, maybe I'm not seating mine as deep or something.
The 284 Win was designed for a short action, however it failed miserably, along with the 350 and 6.5 Rem Mag cartridges, BECAUSE those short actions didn't allow the bullets to be seated out very far, so they ate up powder space by being seated too deep. (Short, carbine barrels didn't help much, either.) It's not just match bullets that are affected by this, but any heavy-for-caliber bullet you might choose.the 284 Winchester was designed for a short action, so the 6.5x284 will work in a short action if hunting bullets are your only projectile. When you get into the really long match type bullets then action length on any 6.5caliber becomes more critical if you're worried about powder space.
The 284 Win was designed for a short action, however it failed miserably, along with the 350 and 6.5 Rem Mag cartridges, BECAUSE those short actions didn't allow the bullets to be seated out very far, so they ate up powder space by being seated too deep. (Short, carbine barrels didn't help much, either.) It's not just match bullets that are affected by this, but any heavy-for-caliber bullet you might choose.
The 6.5x284 has been a great deal more successful than its parent, largely because it has been chambered in single-shot or long-action rifles, where it is not so restricted.