I have not seen anything on this so I thought I'd post this. My brother inadvertently fired 7mm Weatherby Magnum ammunition in his Weatherby Vanguard 7mm Remington Magnum caliber rifle. About eleven rounds were fired with apparently no problems. I made the discovery when I questioned my brother after finding the different fired casings. The fired Weatherby casings now appear as fired Remington casings except slightly longer. I had to see this for myself so I took a Weatherby round and it fed just fine in the Remington caliber rifle. You can see how the confusion can occur. 7mm Remington caliber in a Weatherby brand rifle. Does anybody have any knowledge about this situation? We are taking the Vanguard rifle need to be examined by a gunsmith to see if any damage has been done.