因为环境的要求，美国政府选择粉末金属复合材料，如钨-锡和钨-聚合物复合材取代铅，用于军事打靶的小型武装弹药等目的。粉末金属复合材料子弹的弹芯用机械压制，再装入铜制的金属套中，最后旋锻成最终形状。压制的全过程给于弹芯足够的强度，无需烧结，而粉末金属子弹的所有 Because of environmental requirements, the U.S. government has chosen powdered metal composites such as tungsten-tin and tungsten-polymer composites to replace lead and small armed ammunition used in military targeting. The core of the powder metal composite slug is mechanically pressed, loaded into a copper metal sleeve, and finally swaged to the final shape. The entire process of pressing gives the core enough strength to sinter without the powder metal bullets