John, there are lots of videos of guys using them in 3Gun, which is much more violent than hunting. We flop down prone on them and they stay tight. Better than caddies and in most cases velcro too. Heck, we have some SWAT entry guys using them, and group of guys who went to Argentina to bird hunt with them who had notihng but praise, but yeah, they probably are not good enough for you.
If you want to load just one, only grab one...pretty simple.