Don't know if this is the proper place to post this question, but... I've just acquired an H&R M1900 single shot 12 ga. with removable hinge pin in pretty fair condition. It locks up tight and the bores are in good condition. Does anyone know if it is safe to fire modern 2 3/4" shotshells in this? Does anyone know of a source of low-pressure shells suitable for this? And finally, as an aside, when did most of the shotgun manufacturers go to smokeless powder?
Thanks in advance,
glitch