BLACKHORN 209 POWDER IN STOCK NO FURTHER A MYSTERY

I have a CVA optima in stainless-steel. I also have the black horn 209 breech plug. I load a hundred grains by volume of Blackhorn 209 with a 250 grain Barnes bullet. I have discovered that you actually must use a great primer. Tend not to use the primers made for black powder as this is simply not black powder. I make use of the CCI magnum primers