an energy storing and absorbing material in the chamber, {HEAD ~ said chamber} and material decreasing in {TAIL ~ volume} and having an equal hydrostatic force in all directions upon direct impact with the projectile and returning to the original volume after impact 
decreasing in
an energy storing and absorbing material in the chamber , { HEAD ~ said chamber } and material decreasing in { TAIL ~ volume } and having an equal hydrostatic force in all directions upon direct impact with the projectile and returning to the original volume after impact
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH