Perhaps one of the best balanced and most efficient rifle cartridges ever conceived.
Like the .250 Savage, the 6.5x55 is one of those few cartridges that gives SO much while demanding so little in return.
Quite frankly, you really can't say enough good about the 6.5x55.
I've had a project gun in mind for a number of years, a 6.5x55 built on a Remington action with a light contour barrel by Douglas and one of the ultra light-weight stocks by Bell & Carlson.
Pillar bed the action, cyro-relieve the barrel and firelap it, possibly have a boss-type barrel harmonic tuner put on it, and a medium power scope, and it would be a fantastic general purpose rifle.
Oh well, I can dream.