The Junior hunts in Kaibab, all our kids are using Barnes loaded ammo in .223, .243, .270 and 280AI (handloads, 145 LRX). Most hits average 90 yards. We've not lost a deer, never had to track more than 20 yards, most DRT.
These are generally small does/fawns so cross section of the animal is narrow. Some people have reported narrow wound channels, but we're not seeing it. I bet over the years, the kids have taken 50-60 deer. Probably more.
I do want to slip in some 143 Hammers in the 280AI for one of these kids just to test during this upcoming season.