Speer boat tail bullets are designed for long-range shooting. The tapered heel that gives the bullet type its name reduces aerodynamic drag for flatter trajectories. The boat tails are designed for more rapid expansion than Hot-Cor, so they are an excellent choice for whitetail deer and antelope.
In the larger calibers, they are great for long shots at just about any non-dangerous game. Like Speer's other hunting bullets, the jackets taper from a thicker shank section to a thin nose section to keep retained weights high.
Note: These are component bullets, not loaded ammunition.