I have seen boxes for S&W top breaks that have a large red overprint on the inside of the box top that reads "N.B. - We do not guarantee our revolvers when used with smokeless or nitro ammunition". In fact, S&W didn't approve any of its revolvers for use with smokeless ammunition until 1909. Try googling "Smith Wesson smokeless warning" and you should be able to view some auction listings that clearly depict these boxes.