The 6.5x55 is more like the .308 than the .270 which is a speed- kills kind of round.
The other two are both originally military rounds althouth the .308 is more modern. Both are known for inherent accuracy. The .308 shoots heavier standard shaped bullets. The 6.5 shoots lihgter, longer, bullets that have well deserved reputations for killing effect well beyond their diameter and fps would lead you to expect.
The 6.5 is by far the softest kicking round and this makes it the most shootable.
1B
