Remington 597 has to be the worst .22lr ever made, or at the very least the most unreliable .22lr semi auto that I have ever personally encountered.
Incidentally I've seen a few different .22lr semi autos ranging from the likes of the BSA Armatic and the dirt cheap CBC/Magtech, to the H&K and the Anschutz.
The 597 was so bad that I'm pretty sure that Remington introduced a mark 2 version in an attempt to address some of the reliability issues only a few years after the initial launch. It's certainly a rifle that I would steer clear of unless I were absolutely desperate and the seller was only asking an uncle (a fiver).