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The 8x50R was used as it feed through the magazine and no change to the bolt head. ???

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Look at the bolt head of a Lee – Speed: it is flat, 15 mm = .590” diameter, with no recess for the case rim. The 14 mm rim of the 8x50R Mannlicher fits. Just the extractor claw may need some adjustment. But there is no way a 8x50R Lebel with a 16 mm rim will pass through a Lee - Speed action.