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刚搜了wiki,解释如下:
3.2 g (49 gr) 5N7 FMJ mild steel core 915 m/s (3,000 ft/s) 1,340 J (990 ft·lbf)
3.43 g (53 gr) 7N6 FMJ hardened steel core 880 m/s (2,900 ft/s) 1,328 J (979 ft·lbf)
3.62 g (56 gr) 7N10 FMJ enhanced penetration 880 m/s (2,900 ft/s) 1,402 J (1,034 ft·lbf)
3.68 g (57 gr) 7N22 AP hardened steel core 890 m/s (2,900 ft/s) 1,457 J (1,075 ft·lbf)
5N7是软钢,7N6和7N22是硬钢,7N10是穿甲弹,对不? |
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