This is true, for a variety of reasons, but a bolt action rifle can jam, especially if you go futzing around with the casing or the projectile.

True, but you’d really need to jack up the engraving to get it to jam, and in a case like this, you’re unlikely to need or want a second shot anyway. The only real reason to bring multiple rounds is in case of a misfire (unlikely to be caused by an engraving), because once you fire, you’re running if you want any shot of getting away. So it getting stuck ejecting isn’t really an issue, and that’s already an incredibly remote chance.

And I don’t understand how you’d double feed here. The shooter obviously had some training and was only going to take one shot anyway.