If what you're is feeling a protrusion of rust, scrape or etch it off. Don't make the new rings scrape it off.
If it's a palpable or measurable groove, how can rings ever seal there? It will trap oil, which will be pushed up into the combustion chamber and burnt.
How can the rings keep (or ever get) their bedded-in edge while being forced over that furrow hundreds of times a second, for hundreds of hours?
Will it break rings? I don't know.
You don't have much to lose by honing the entire bore until the groove cannot be felt, then measuring. I don't know what the absolute maximum piston clearance on an A10, but I don't see why you wouldn't get off with 7 or 8 thou.
An oversize parallel bore is better than a tight bore with a loose bit.