▁far ▁forward ▁as ▁is ▁practical , ▁which ▁is ▁how ▁the ▁M ini é ▁ball ▁and ▁the ▁sh utt le cock ▁are ▁designed . ▁This ▁makes ▁the ▁bullet ▁fly ▁front - forward ▁by ▁means ▁of ▁aer od ynam ics . ▁ ▁See ▁the ▁articles ▁on ▁terminal ▁ball istics ▁and / or ▁stopping ▁power ▁for ▁an ▁over view ▁of ▁how ▁bullet ▁design ▁affect s ▁what ▁happens ▁when ▁a ▁bullet ▁impact s ▁with ▁an ▁object . ▁The ▁outcome ▁of ▁the ▁impact ▁is ▁determined ▁by ▁the ▁composition ▁and ▁density ▁of ▁the ▁target ▁material , ▁the ▁angle ▁of ▁inc idence , ▁and ▁the ▁velocity ▁and ▁physical ▁characteristics ▁of ▁the ▁bullet ▁itself . ▁Bul lets ▁are ▁generally ▁designed ▁to ▁pen et rate , ▁de form , ▁or ▁break ▁apart . ▁For ▁a ▁given ▁material ▁and ▁bullet , ▁the ▁strike ▁velocity ▁is ▁the ▁primary ▁factor ▁that ▁determ ines ▁which ▁outcome ▁is ▁achieved . ▁ ▁Bul let ▁shapes ▁are ▁many ▁and ▁varied , ▁and ▁an ▁array ▁of ▁them ▁can ▁be ▁found ▁in ▁any ▁re loading ▁manual ▁that ▁s ells ▁bullet ▁m ould s . ▁M ould ▁manufact ur ers ▁such ▁as ▁RC BS , ▁Paul ▁Jones ▁M ould s , ▁and ▁David ▁Mos ▁offer ▁many ▁different ▁cal ib ers ▁and ▁designs . ▁With ▁a ▁m ould , ▁bul lets ▁can ▁be ▁made ▁at ▁home ▁for ▁re loading ▁one ' s ▁own ▁am mun ition , ▁where ▁local ▁laws ▁allow . ▁Hand - cast ing , ▁however , ▁is ▁only ▁time - ▁and ▁cost - effect ive ▁for ▁solid ▁lead ▁bul lets