For a bear skin and some fat to stop a .243 round seem crazy. Neither is that tough. I wonder if they were dud ammo for some reason. Sounds like the cartridge didn't perform and wasn't the bullets fault.
I like onx. I have used it alot in NY and brought it to Montana and used it as my GPS. Worked great. Just have to keep it in your head you can be real close using the maps or 30 off in either direction.