This is an article about a rifle kaboom. the cause was attributed to a mix of rifle and pistol powder from a hopper that did not have all the previous powder removed before adding the new powder.. I post this as a caution to others , like myself, that reload for rifle and pistol. Checking for a double charge is important but making sure it's the correct powder seems pretty important too.
http://sinistralrifl...-rumor-control/
http://sinistralrifl...-rumor-control/