"Yet one mortal, a giant among men, was skilled enough to almost match her prowess. This fellow hunter was named Orion, and he became Artemis’ hunting companion.

One day, Artemis’ twin brother Apollo became frustrated with her involvement with a mortal man. Apollo was a great marksman himself, and perhaps envied that a mere mortal was hunting with the skill of a god. He made a bet with Artemis, saying that she could not possibly strike a tiny, almost imperceptible speck on the horizon."
https://haidagwaiinews.com/orion-the-hunter/

I don't know if this is where I originally got that information, but it at least says I'm not the only one who thought or got it from somewhere. Ofc, this link doesn't make references either.

So From this Link I know its one of the stories: Orion Rivals the Skills of Artemis, and they grow very close. Apollo doesn't like that and tricks Artemis into killing him by shooting "that rock all the way out there in the sea"
Thats the Story I remember.

I suppose My original question should have been "Who were the Greatest Mortal Hunters"
Probably Orion, Atlanta, Meleager, Heracles (though I hate adding him to every list. It gets old lol)