Which is it guys? Concerning breech plugs. I have a flat one in my CVA Staghorn. I have a shallow concave in my Black Diamond XR. I have the Grand Canyon deep,in my Knight rifles. Which ones are best for pellets? I was told the concave were better for loose powder as the powder gathers in there right on top of the flame from the 209 primer, where the flat ones have to channel the flame through the flat base with the narrow hole into the center of the pellets.

I have always wondered about that. By the way, my Black Diamond XR with the concave hole shoots pellets excellent....