I finally have a 6.5 RPM. On the left is my wildcat 6.5. An unfired case holds 80.3 grains of water. On the right is the Weatherby 6.5 RPM. The unfired case holds 80.0 grains of water. I can't fire it because it's at the 'smiths. He ask if he could work up a load for it. I am looking forward to seeing if he matches my wildcat. I wouldn't be surprised if he excedes my load since I run them fairly conservitively.