$17, Hornady 2550 25 Caliber 117 Grain RN/100

Rifle Bullets25 Caliber (.257)117 Grain Round NosePacked Per 100Hunters worldwide use InterLock bullets to take everything from antelope to zebra and from whitetails to wildebeest. It's such a proven performer, Hornady selected it to load into enhanced performance Light Magnum and Heavy Magnum ammunition. How the Interlock Bullet works: It all happens in less than 1 /100th of a second. Yet it takes decades of experience in the design and manufacture of bullets to make it happen the same shot after shot after shot. InterLock consistently performs under more shooting conditions than any other bullet. 1. On impact, the soft lead point is immediately pushed back and begins to expand in diameter. 2. The copper jacket, inner grooved at the bullet's point, folds back behind the leading edge of the expanding lead core. 3. The classic mushroom is achieved by the jacket and core expanding at the same rate. Expansion is controlled by increased resistance from the growing thickness of the coppe.

Source: http://www.manventureoutpost.com/products/Hornady-2550-25-Caliber-117-Grain-RN%7B47%7D100.html?google=1