savagescout
They do not have to be really tight but they shouldbe snug, when you pull the trigger they will obturate and seal the bore.
UC - Dag-nab-it - is cause I couldn't go right then and shoot - I still haven't got out -I have to wait to when it fits in... and the worst part is I have work Monday and Wednesday - but it is on the Forest locating a new trail segment, so that makes it some what OK.