. ▁Cast ▁and ▁jack et ed ▁bul lets ▁are ▁also ▁commer cially ▁available ▁from ▁numerous ▁manufact ur ers ▁for ▁hand ▁loading ▁and ▁are ▁much ▁more ▁convenient ▁than ▁casting ▁bul lets ▁from ▁bulk ▁lead . ▁ ▁Prop ulsion ▁ ▁Prop ulsion ▁of ▁the ▁ball ▁can ▁happen ▁via ▁several ▁methods : ▁ ▁by ▁using ▁only ▁gun pow der ▁( i . e . ▁as ▁in ▁fl int lock ▁weapons ) ▁ ▁by ▁using ▁a ▁per cussion ▁cap ▁and ▁gun pow der ▁( i . e . ▁as ▁in ▁per cussion ▁weapons ) ▁ ▁by ▁using ▁a ▁cart ridge ▁( which ▁contains ▁primer , ▁gun pow der ▁and ▁bullet ▁in ▁a ▁single ▁package ) ▁ ▁Material s ▁ ▁Bul lets ▁for ▁black ▁pow der , ▁or ▁m uzz le - loading ▁fire ar ms , ▁were ▁class ically ▁m old ed ▁from ▁pure ▁lead . ▁This ▁worked ▁well ▁for ▁low - speed ▁bul lets , ▁fired ▁at ▁veloc ities ▁of ▁less ▁than ▁ 4 5 0   m / s ▁( 1 4 7 5   ft / s ). ▁For ▁slightly ▁higher - speed ▁bul lets ▁fired ▁in ▁modern ▁fire ar ms , ▁a ▁harder ▁al loy ▁of ▁lead ▁and ▁tin ▁or ▁types etter ' s ▁lead ▁( used ▁to ▁m old ▁Lin ot ype ) ▁works ▁very ▁well . ▁For ▁even ▁higher - speed ▁bullet ▁use , ▁jack et ed ▁co ated ▁lead ▁bul lets ▁are ▁used . ▁The ▁common ▁element ▁in ▁all ▁of ▁these , ▁lead , ▁is ▁widely ▁used ▁because ▁it ▁is