BLACKHORN 209 POWDER IN STOCK NO FURTHER A MYSTERY

I've a CVA optima in stainless-steel. I even have the black horn 209 breech plug. I load one hundred grains by volume of Blackhorn 209 by using a 250 grain Barnes bullet. I have discovered that you truly must use a very good primer. Usually do not use the primers designed for black powder as this is not black powder. I use the CCI magnum primers on