RE: 6.5x55.....
It is one of the best whitetail rounds going. Deep penetration and gentle recoil make it an almost ideal hunting round for a lot of game. Although you can still get the extremes of the 160 and 87 grain bullets, it seems to do pretty great with 140 grainers. I believe the long length for diameter helps its "freight train" effect for penetration. I agree with Finn Aagaard (deceased) when he said that he believes that the 6.5 X 55 Swede 140 grain would likely have better penetration than his 180 grain 30/06 pet loads.