Weatherby Select Plus Ammunition, 300 Weatherby Magnum, 180 Grain, Barnes Tipped Triple Shock X, 20 Round Box, California Certified Nonlead Ammunition B300180TTSX Ultra-high velocity, magnum ammunition is how Roy Weatherby got started in the 1940s. Today, those same performance qualities are every bit a part of Weatherby cartridges. When combined with a Weatherby rifle, Nothing Shoots Flatter, Hits Harder or Is More Accurate.