Choosing the ideal shotgun slug for a fully rifled barrel used to be somewhat of a challenge. Winchester makes the decision much simpler with the Supreme Elite XP3 sabot slug. The XP3 has a polymer tip and tin core. It delivers high velocity, lethal knockdown power and is certain to impress hunters who use slugs for whitetail deer or hogs. The XP3 is designed for use in fully rifled barrels only.