The easiest solution is to look at the factory cartridge box and see if there’s a deer on it. Or better yet, a deer and an antelope. This is the sign of a quick expander, and it is what you’re after. Some ammo makers even say right up front, “For deer and thin-skinned game,” or words to that effect. These bullets have thin jackets, very often feature fracture lines near the nose to help it start expanding, and either a nylon tip or a lead tip with lots of lead exposed. Browning BXR Deer ammo, for example, says “deer” right on the box, and has a deer’s head looking at you. You can’t get much more direct than that.