I know someone who bought a 6.5x55 on the advice of an "expert", he is now sick as a chip and looking to go back to 25/06.
Hardly surprising is it i have had a few calibers and liked them all, however two calibers are mentioned in this post, 22 hornet and 6.5x55, these are the two calibers I love, and use most of the time, if you are ever taking a novice out, or you have a flincher at point of fire, the 6.5x55 is superb, it drops red roe or fallow as good as any caliber, and you always see the bullet strike,