I've never owned or even shot one but from what I've read, it's fairly easy to shoot out a barrel in one. That's common with most hot calibers smaller than 30 cal. They generate a lot of heat and shooting a lot of hot loads can seriously overheat one. Of course it can be done with larger cals, too, but it's easier with smaller ones.
That said, the 7mm is famous for being an excellent elk round.
