[Yardstick]

Personally, I would rate it PG-13.

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R is obviously the correct rating for Joker. It’s not even a close call.

You don’t get to show point blank pistol shots to the head with blood spattering on the wall behind in PG-13 films.

[Mariner]

https://video.search.yahoo.com/search/video?fr=yfp-t&p=true+grit+shooting+scene+in+cabin#id=2&vid=bf1a5e7ab156b2f6f47cf130a41769e5&action=click

From True Grit, a PG-13 movie.

And there’s also this scene...

https://www.youtube.com/watch?time_continue=12&v=OQuPkquz7R0

There’s more.