I had a million issues with my .597. I used it as a chance to start working on guns, and now it runs like a champ. I've read countless stories about the original magazines being the problem, and I believe it, as when I bought a new 30 round magazine, the problems vanished.
I free floated the barrel, polished the internals and took a stone to the trigger, as well as painted it.
Check out volquartzen. They make tons of aftermarket things for the 597.
I went from hating this rifle to using it the most. Hopefully you get a good one... But keep in mind, I bought mine in 1998, so I'm sure any issues have been worked out by the factory.
Also, I wrote Remington about my issues and they promptly offered to send me free magazines, so I think the company is solid.