Winchester Xtended RangeTM Bismuth pairs ShotLok Technology with bismuth shot, resulting in optimum performance for turkey, waterfowl and upland hunting in areas that require lead-free shot. With density greater than steel, bismuth shot offers improved penetration that nears that of standard lead loads. ShotLok Technology is used to protect the bismuth shot from fracturing, which improves pattern density and increases downrange energy, when compared to standard lead loads. Xtended Range Bismuth puts twice the number of pellets in a 20-inch circle at 60 yards.