Question: The ballistics of the .260 Remington are basically similar to a cartridge developed in what year?
Sentence (from "6.5×55mm"): The 6.5×55mm (designated as the 6.5×55 Swedish by the SAAMI and 6,5 × 55 SE by the C.I.P.) is a first-generation smokeless powder rimless bottlenecked rifle cartridge.
Relevant evidence: Yes