Combustion converts fewer than 50 % the mass of gunpowder to fuel; nearly all of it turns into particulate subject. Some of it is ejected, losing propelling electric power, fouling the air, and customarily getting a nuisance (giving freely a soldier's situation, building fog that hinders eyesight, and so on.). https://greatgotfirearms.com/product/goex-fffg-black-powder-1-lb-in-stock/