As with other Sierra manufactured bullets Sierra Pro-Hunter Rifle Bullets come in various calibers diameters and grains. Unique to these bullets is the traditional flat base design that skillfully balances the accuracy known by competitive shooters from around the globe. This particular bullet has a custom tapered jacket that ensures maximum expansion as well as optimum weight retention. Another popular feature of these bullets is the deep penetration. This capability produces the clean one-shot kill that is so vital to responsible and seasoned game hunters. Regardless of the option chosen all Sierra bullets are made from quality materials and workmanship.