When you drop below that velocity zone, bullet expansion becomes unreliable. In some cases, as with the bullet found in the elk, there is no expansion at all. To be more specific, take the 140-grain bullets loaded by Remington in its standard 7mm Rem. Mag. ammo. These bullets are designed for optimum expansion at a range somewhere between 75 and 200 yards (the take-a-guess factor again), when velocity has dropped to somewhere between 2,700 and 2,800 fps. With the Managed Recoil 7mm Rem. Mag. load, velocity will be roughly 400 fps less at those ranges. In other words, a bullet designed for best expansion at 2,700 fps will possibly expand poorly--or not at all--at 2,300 fps.