18 yards is a good range
Last night, I had to stop shooting for a few mins, as six whitetails wandered through, coming from the other end of the drive, which I ranged at about 120 yards. They passed my targets, meandered across the hillside eating the grass (just greening up now), then dipped below the fence at about 20 yards. One young, curious one, came nearly to the fence to see what I was up to, which would be about 15 yards downhill. They were heading to the creek way down the hill, to water up at dusk, I suspect.
If I didn't enjoy them wandering around here so much, I'd be tempted
Maybe the moose will come back this fall, and try the Mulberry tree leaves again. She did NOT like them last fall. LOL, she leaned over the fence, took a mouthful (they were the only green visible anywhere by the end of October), and then went "Blecch!" and spat them out on the ground. Not like tasty willows, I guess...