209 Primers For Sale. The 209 primer is a type of shotgun primer used in shotshell ammunition. It is known for its reliable ignition and hot, consistent spark, making it a popular choice among hunters and competitive shooters. The 209 primer is used in both black powder and modern smokeless powder shells and is widely available from most major ammunition manufacturers. One of the benefits of the 209 primer is its large sweet spot, which allows for a more forgiving ignition compared to smaller primers, making it easier to ignite the gunpowder in the shell. The 209 primer is commonly used in single-shot shotguns, as well as in-line muzzleloaders. Overall, the 209 primer is a reliable and widely-used primer in the world of shotgun shooting and hunting. 209 Primers For Sale.