Discussion board member and gunsmith Michael Ezell agrees that N320 is a good selection with the .45 ACP. Mike has also uncovered that WW 231, although accurate, produces sparks and a large flash. Mike writes: “I initially commenced utilizing N320 immediately after my first night time shoot, when shooting IDPA/IPSC https://handloadingsupply.com/product/572-winchester-smokeless-powder-1-lb/