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Unfortunately, like the 7×57 Mauser, factory ammo ballistics for the 6.5×55 are unimpressive because unless otherwise noted, it’s loaded to lower pressure levels for safe functioning in surplus Swedish Mausers and Krags. 260 Remington, which was introduced in 2002, the Swede’s 25-degree shoulder actually makes it a more modern case design, and one that has virtually the same powder capacity and, assuming handloads in modern rifles, the same performance potential. Though it remains a highly popular cartridge in Europe to this day, especially in Scandinavian countries, it was virtually unknown here until the 1950s when inexpensive military surplus rifles and ammo became available. was the 6.5×55 Swedish Mauser that was adopted by the Norwegian Joint Military Commission in 1894. Magnum in 1958, the only 6.5 to achieve any measure of popularity here in the U.S. But before we take a look at the new RPM and its host rifle, the Mark V Backcountry, I think a brief review of the 6.5’s history on these shores in is order. According to factory ammo specs, it can lay claim to be the fastest commercial 6.5. I say another because just two years ago they introduced the 6.5-300 Weatherby Magnum, a cartridge which, as its moniker indicates, is derived from necking down the. Am I the only one suffering from 6.5 overload? If you haven’t heard by now, Weatherby has introduced another 6.5mm cartridge - the 6.5 RPM (Rebated Precision Magnum), along with a new Titanium iteration of its excellent Mark V standard size action.