Weatherby Select Plus, 257 Weatherby Magnum, 100 Grain, Tipped Triple Shock X Bullet, 20 Round Box B257100TTSX 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.