《梦溪笔谈·器用》
韩魏公泾原帅时，曾取出做过试验，在五十步开外，用强弩来射它，不能射穿。
韩魏公帅泾、原，曾取试之。去之五十步，强弩射之，不能入。
When Han Weigong was the commander of Jingyuan, he once took it out to test it, and from a distance of fifty paces, he used a strong crossbow to shoot it, but could not pierce it.