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The result was the .280 Ross cartridge, produced and catalogued as the “.280 Rimless Nitro-Express” and head-stamped simply “280 Ross.”

Appearing in the first decade of the 20th Century, the .280 Ross offered the sporting world ballistics never been seen before. Here was a 7mm cartridge, loaded with a 140-grain spitzer soft-point, capable of reaching velocities of over 3,000 fps in the Ross Model 1910 sporter with a barrel length of 26″ to 28″. It was the ballistic marvel of its day. Kynoch catalogued the load as having a velocity of 3,010 fps, along with a 150-grain spitzer at 2,920 fps, a 160-grain, round nose HP load at 2, 910 fps and a 180-grain target match loading at 2,760 fps.
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https://gunsmagazine.com/ammo/the-280-ross/