Probably how I felt Jim when shooting my mates 460 Weatherby Magnum with 500Gn projies at 2,500Fps on the 3rd round I fired I left my mouth shut.
I can honestly say I tasted enamel from my teeth, I also bench rested it with 1 round so I can say I've done it without a dead sled, that was not much fun!
But my mates tougher than me he went through 19 rounds off the bench rest!

In the semi enclosed shooting area that thing brought every bit of dust down that was there and fairly resonated in the tin when fired, but even with a dead mule in the stock and a custom stock you gotta hang onto it and prepare yourself for the event!