Hacker News Reader

HN proper doesn't, but I run hnrss.org which can do this:

https://hnrss.org/newest?points=50 (100 and 150 also supported)

I am using https://hnrss.org/frontpage?points=200&comments=200, not sure exactly what it does but it works for me to not miss out on anything (I think)

I believe this is how the main RSS news.ycombinator.com/rss works. You should only get the "frontpage".

I am not sure you can filter. Maybe you could obtain something more specific building a special RSS feed through the API ( github.com/HackerNews/API )?