In {TAIL ~ a sabot projectile}, {HEAD ~ a projectile core} is held fast in a sabot 
In
In { TAIL ~ a sabot projectile } , { HEAD ~ a projectile core } is held fast in a sabot
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH