Grand slam has two different alloys. The rear core is formed from tough five percent antimony lead to resist deformation. Hard alloyed core is locked in at the base and molten soft lead is poured infusing itself to the base core and jacket. It has a protected point design. Jacket opening is thin and fluted to aid expansion. Speer grand slam has a softer hot-cor nose core and rear core is of 5% antimony lead which is secured by a lock ring.