Thread: Cleaning rust from chamber?

Hi guys, New guy here, not much experience with cleaning.

I just bought my first centrefire rifle; a second hand .243
I've discovered some small spots of rust in the chamber (not 100% sure that 'chamber' is the correct name of the area -it's the bit just before the main part of the barrel, and is wider than the main barrel)

What's my best approach?
I've heard using steel wool and CRC? How big an issue is this? Is this an issue of accuracy, or is this a 'blow up in your face' kind of deal?

Keen to hear any thoughts, advice, personal experience.