Remington cartridges. While the 6.5×57mm and 6.5×55mm both require a long-action receiver, the shorter .260 Remington being (based on the .308 Winchester cartridge) can be fitted to a short bolt-action format. Other 21st century cartridges, like the 6.5×47mm Lapua and the 6.5mm Creedmoor that have entered the market also are able to provide similar performance to factory 6.5×55mm ammunition. However, the extra case volume of the 6.5×55mm promotes a longer lifespan of the cartridge case when reloading, and will provide higher velocities when handloaded to the same pressure as its more modern counterparts. However, the approved chamber pressure ratings for older rifles then may be exceeded. Cartridge specifications Original specifications All Swedish Mauser bolt actions were proof tested with a single 6.5×55mm proof round developing approximately piezo pressure (55,000 CUP psi). The book Norske Militærgeværer etter 1867 cites each Norwegian military Krag–Jørgensen rifles in the beginning was fired at the factory (either Kongsberg Våpenfabrikk or Steyr) with proofing rounds rated at , and copper units of pressure. After a while, use of the proofing rounds was dropped, as they were viewed as "unnecessarily powerful". Proofing with and rounds was continued, as they were viewed as necessary to get the action threads "set" and thereby "strengthening the barrel". During this process, the chamber tended to lengthen by and a maximum of was accepted. Swedish and Norwegian chamber differences rumor Some historians have assumed that there was a difference in cartridge blueprint measurements between Swedish and Norwegian 6.5×55mm ammunition, but this may be unintentional. Due to different interpretations of the blueprint standard, i.e. the standards of manufacturing using maximum chamber in the Krag vs. minimum chamber in the Swedish Mauser, a small percentage of the ammunition produced in Norway proved to be slightly oversize when chambered in the Swedish Mauser action, i.e. requiring a push on the bolt handle to chamber in the Swedish arm. A rumor arose not long after the 6.5×55mm cartridge was adopted that one could use Swedish ammunition in Norwegian rifles, but not Norwegian ammunition in Swedish rifles. Some even alleged that this incompatibility was deliberate, to give Norway the tactical advantage of using captured ammunition in a war, while denying the same advantage to Sweden. However, after the rumor first surfaced in 1900, the issue was examined by the Swedish military. They declared the difference to be insignificant, and that both the Swedish and Norwegian ammunition were