The 6.5x55 Swede, one of the most popular European cartridges for big game, migrated to North America in the late ’50s with the arrival of thousands of surplus Mausers. Even though this round has an amazing pedigree—designed in the late 1800s, it had a distinguished military career lasting decades, has an unimpeachable reputation on large game, and regularly won gold medals at the Olympics, thanks to its accuracy—it, too, suffered from the 6.5 curse and failed to reach the summit of the mountain. Likewise, the .260 Remington, a personal favorite, has struggled, though it gamely fights on. The same goes for the 6.5-284 Norma. Strike three.