In know way am I blamming the message, (B209).I know the messengers were at fault, (that being us). We wereprobably doing a lot of things wrong inthat brief range session. I can gaunranteethat we were shooting much too fast between shots and that is because of the fascination with not having to swab. I do believe he was using regular W209 primers. And I"ll take an educated guess and say his breech plug was not spotless.
That is why I came looking for answers on this site.