其实就是7*57毛瑟圆头弹,多被南美国家使用
里面就明说了:National pride kept us from simply adopting the far gentler but equally effective 7x57 that had so recently embarrassed both British and American forces.
“民族自尊使我们没有直接采用这种后坐力温和得多(这里是和后来的.30-06比)但同样高效的7x57弹药,因为这种弹药近代曾令英、美军十分窘迫(指多次南美洲的各大殖民的反抗运动)。