I. Just bought a bunch of 375 Weatherby notma brass to make into 416 rem mag brass .I HOPE it's WAY better than all the 416 Remington brass loaded through the years it's too thin IT looks like I can just neck the 375 Weatherby brass up to 416 rem mag brass and load it .I thought about firefornimg it but 500 pcs is a bit too much and powder and primers are not easy to find especially fed 215 .I am very surprised there are not alot more 375 Weatherby. I KNOW only one friend that has one but it cut the barrel to 22 inches .Hopefully this turns out well and I can shoot my 416 alot more .