With the greatest respect, guys, generally rocks are not considered good targets no matter what you are launching at them downrange, for fear of ricochet. So we all know you were just kidding about shooting rocks, and the younger folks reading this can know that it was just a joke, so they don't go into their back forty (or their local range) and start shooting at rocks with their shootin' irons.........
I owned a Ruger 77 Mark I for four rounds. Handloads courtesy of Casull here on the board, who sold me the gun. Cast bullets about half the size of a Scheider's Red Hot hot dog sticking out the end of the case, and the gun made a swooshing sound when I opened the bolt, from the air rushing in......
Four rounds with the .458, or four rounds with George Foreman, about the same feeling....
Doug