Speer Grand Slam - The Speer Grand Slam is Speer's premium bullet offering designed to provide ideal terminal performance in regards to expansion and penetration on large game. The original Grand Slam was a dual core design, with the front portion being constructed from a softer lead for expansion, whereas the rear core was composed of a harder lead alloy designed to retain weight upon impact. The new design came about as material availability made it difficult to maintain the dual core design, and as such, the single core design was created. The current Speer Grand Slam design features a drawn jacket with a thicker shank at the heel, tapering to a thinner section along the nose. A pocket is swaged along the interior of the heel to mechanically hold the core upon insertion, and fluting is cut length-wise along the interior of the nose of the jacket to allow controlled expansion upon impact, giving the bullet its expansive properties. A ternary molten alloy of lead, tin, and antimony is then poured into the jacket, which prevents oxidation between the jacket and core as seen with conventional cup and core bullets. This feature resists core slippage upon impact. The new design has resulted in improved accuracy due to the single core, in addition to better weight retention than the previous design.
So as I see it, for about 70 cents to a buck a bullet, you get a cup-and-core on steroids.
