Most of the plastic tipped bullets (ie: Nosler Ballistic Tip, Winchester Ballistic SilverTip, Swift Scirroco, etc) were designed to eliminate lead bullet tip deformation upon chambering. The hard plastic tip won't deform during loading, thus increasing accuracy at long range, and also helps expedite expansion. The plastic tip jams back into the lead on impact making this type dynamite on deer sized game. On the other hand, bullets like the Winchester FailSafe, Swift A-frame, and Trophy Bonded are made to expand slowly and maintain a higher percentage of their initial weight providing deep penetration and more likely giving you an exit hole on every shot. They're usually recommended for larger game such as elk or moose, or in cases where the extra hole in the hide will make tracking easier.