Normally there are two different types of blanks used at funerals. (At my American Legion anyways) One has an extended case neck and a red waxed cardboard disk keeping the powder in the case. The second type is also an extended case neck if i recall and is crimped to keep the powder in. You may have to trim down the case mouth to normal length to get it to work if there isnt enough case mouth tension to hold the bullet in place and have to run the case through a sizing die?