Guys, guys, you actually have to shoot the load in your gun over a chronograph to see what it is really doing. I'm quite dubious about any numbers the manufacturer publishes. They are usually marketed to the high side of reality to get you to buy their product. A quick check of my data sources only Sierra and Nosler list loads for the 270 Weatherby that achieves these velocities and only 2 powders listed for each. Now try and tell me that the 270 WSM is going to outperform a 270 Weatherby with 150 gr bullets.