From the business end of a Mossberg 500!
Check your local shooting supply store, they should have it, Dick's would as well. Get smallish shot, typically the higher the number the smaller the shot, #8 or better would be my recomendation, thus occupying more of the space and displacing more of the air. Select shooting stores offer lead "dust" shot, which is super cheap and probably the way to go if you can find it. Good luck.
Check your local shooting supply store, they should have it, Dick's would as well. Get smallish shot, typically the higher the number the smaller the shot, #8 or better would be my recomendation, thus occupying more of the space and displacing more of the air. Select shooting stores offer lead "dust" shot, which is super cheap and probably the way to go if you can find it. Good luck.