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I would say its a 6,5x53R Mannlicher(Rumanian and Dutch military round) the rimmed predecessor of the well know 6,5x54 MS, same ballistic

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The original 6.5mm examples are interesting because of the difference and compatibility of the same. The 6.5x53.5mm Rimmed and the 6.5x54mm are the only example of a rimmed and rimless cartridge being loaded to the same performance level, something that probably explains the use of the 6.5mm Rimmed by explorers such as Charles Sheldon well into the twentieth century, when the more modern rimless 6.5x54mm was already well established. Somehow, I don’t believe that modern power or design ever entered into Sheldon’s mind. He wanted performance and CHEAP, and the 6.5x53.5mm rimmed gave both to him, there is no accounting for taste!
On the other side of the coin, the 6.5x54mm was widely accepted by the hunting establishment when they discovered the potency of the long nosed 160 grain FMJ bullets when used upon dangerous game.

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From Kynoch, 140g SN, 26" barrel, 17.5 tons/sq.in, 2700fps

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