What kind of 24/40 case is it? I've been having problems with mine. It keeps blowing the aft closure when the igniter starts and before the propellant can fire.
Has your casing experienced a previous CATO???
If so, the threads might have been damaged. I'd say try putting the aft closure on the opposite end.
If you tried that and it still spit the aft closure, chances are you'll have to replace the casing and/or closure.
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