Weatherby Select, 270 Weatherby Magnum, 130 Grain, InterLock, 20 Round Box H270130IL 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.