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The 6.5X55 outpaces the others IMHO. Same plug and play performance at higher velocity (especially when coupled with modern barrels and actions).
However, if you put the 6.5X55 in a short action, some bullet choices are going to land you in a situation where you run out of magazine before you run out of chamber throat, and on occasion a precision rifle likes to have those bullets seated close to the lands.
Also, 6.5CM is very very available due to its popularity whereas the 6.5X284, 6.5X55, 6.5X47, 260 Remington, and others are relatively harder to find.