Between myself and the kids, we're up to 7 or 8 in the past couple years. Both supersonics and subsonics, all 1 shot kills. We did have one big doe that my son shot that we had to track about 100 yards (he hit her a little far back). All the ones I've shot have gone less than 40 yds.
By FAR the best round to start a young kid deer hunting with.
All of my kills were out of a 16" bbl custom built bolt gun.
It's NOT just a 50 yd gun.... mine will shoot supersonics under 1" at 100 yds, and the 125g NBT's will expand perfectly down to 1800fps (around 200 yds with a 16" bbl)