I have taken a couple at 50ish mark. Used Rocket Miniblasters on two of them and a Punchcutter on one. Both are mechanical heads. The Punchcutter is no longer in production. It was one of the first mechanicals back around the early 90's.

I took a shot at a doe that was walking at 15 yds. but hit her back too far. She went about 50 yds and bedded down. After a bit she stood up and started to walk away. She stood in the open at 50yds. I put the next arrow where the first one should have went.

I don't recommend shooting that far unless you practice those kind of yardages and farther. Also only take that shot when conditions are perfect.