Forum member and gunsmith Michael Ezell agrees that N320 is a sensible choice with the .45 ACP. Mike has also identified that WW 231, when accurate, creates sparks and a big flash. Mike writes: “I first started making use of N320 following my initially night time shoot, though shooting IDPA/IPSC https://handloadingsupply.com/product/572-winchester-smokeless-powder-1-lb/