Had my new to me 2.5 inch 686 out the other day. It was bright and sunny and we filmed some shots in slo-mo at 120 frames per second with my Iphone. These shots were a 125gr Hornady XTP with 21.1gr on Winchester 296 powder. Win 296 has a reputation for muzzle flash, especially from a short barrel. Goodness, Gracious ........