Apparently the North American factory ammo (and likely brass) are made with brass destined for the 30-06 and therefore, slightly undersized. Some people make handloads for 6.5 x 55 SM using 30-06 brass, but other sources say that this is not a good idea as the brass has to stretch to fill the chamber.
Also, as stated, the North American factory ammo is loaded-down but the European stuff would generally be loaded hotter.
That said, my guess is that the Hornady Superperformance would be loaded more like the European stuff.
If you have an old Mauser, the North American stuff (except the Hornady) or modest handloads would be appropriate but if you have a newer rifle, the European ammo, Hornady or appropriately loaded hand loads would be well suited
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