▁military ▁am mun ition ▁in ▁ 1 9 0 1 , ▁for ▁the ▁French ▁Leb el ▁Model ▁ 1 8 8 6 ▁rif le . ▁ ▁A ▁ball istic ▁tip ▁bullet ▁is ▁a ▁h ollow - point ▁rif le ▁bullet ▁that ▁has ▁a ▁pl astic ▁tip ▁on ▁the ▁end ▁of ▁the ▁bullet ▁itself . ▁This ▁impro ves ▁external ▁ball istics ▁by ▁stream lin ing ▁the ▁bullet , ▁allowing ▁it ▁to ▁cut ▁through ▁the ▁air ▁more ▁easily , ▁and ▁impro ves ▁terminal ▁ball istics ▁by ▁allowing ▁the ▁bullet ▁to ▁act ▁as ▁a ▁J HP ▁on ▁impact . ▁ ▁As ▁a ▁side ▁effect , ▁it ▁also ▁fe eds ▁better ▁in ▁weapons ▁that ▁have ▁trouble ▁feed ing ▁r ounds ▁that ▁are ▁not ▁FM J ▁r ounds . ▁ ▁Design ▁ ▁Bul let ▁designs ▁have ▁to ▁solve ▁two ▁primary ▁problems . ▁In ▁the ▁bar rel , ▁they ▁must ▁first ▁form ▁a ▁se al ▁with ▁the ▁gun ' s ▁bore . ▁If ▁a ▁strong ▁se al ▁is ▁not ▁achieved , ▁gas ▁from ▁the ▁prop ell ant ▁charge ▁le aks ▁past ▁the ▁bullet , ▁thus ▁reducing ▁efficiency ▁and ▁possibly ▁accuracy . ▁The ▁bullet ▁must ▁also ▁eng age ▁the ▁rif ling ▁without ▁dam aging ▁or ▁excess ively ▁fou ling ▁the ▁gun ' s ▁bore , ▁and ▁without ▁dist ort ing ▁the ▁bullet , ▁which ▁will ▁also ▁reduce ▁accuracy . ▁Bul lets ▁must ▁have ▁a ▁surface ▁that ▁forms ▁this ▁se al ▁without ▁excess ive ▁fr iction . ▁These ▁interactions ▁between ▁bullet ▁and ▁bore ▁are ▁term ed ▁internal ▁ball istics . ▁Bul