I'd go with the 6.5x55 if you plan on using it out to 600 yards. The 6.5mm's are notoriously good at bucking the wind and as far as I know are always up there in the 1000 yard competition circuit. The 6.5 x55 would also convince the deer to lay down right there better than the .243 could. I bought a .25-06 recently and wish that I would have gone with the 6.5x55 after reading up on it. Not a lot of recoil, Bullets with high ballistic coeffecients and sectional density that makes them keep up there velocity and penetrate well on game.
Jeo556
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