I have recently started flying mid power rockets (Aerotech Tomahawk and Initiator) and have had relative success. However, on a couple of launches using the 24/40 housing and an F load, the grain did not fire but the ejection charge did. The last result of this was a housing blown into the motor tube and an hour search for the rear bulkhead. My current theory is that the ignitor (Copperhead) was in contact with the delay and lit the delay and not the grain. Has anyone had this problem and have a solution?