WHAT DOES BLACKHORN 209 POWDER IN STOCK MEAN?

I am just viewing this as my starter gun to obtain my ft wet. If I turn out liking it and part availability enhances in the future, I can always improve.It’ll function with pellets or powder. They advise the BH209 breach plug mainly because it has a larger flash channel; it’s only $35 so I did it.Blackhorn 209 has not been discontinued, Hodgdon