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