{HEAD ~ A downwardly angled small pressure release hole} can be drilled into {TAIL ~ the closed end} so that gasses from firing the blank can be safely discharged 
drilled into
{ HEAD ~ A downwardly angled small pressure release hole } can be drilled into { TAIL ~ the closed end } so that gasses from firing the blank can be safely discharged
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH