You guys have got it all wrong. I've got a special machine to carry my rifle that's called an Eddie o Matic.
I just have Eddie carry my rifle over his shoulder using the Africa carry, and I walk behind him and can get it into action at least as fast, and probably faster than if I had it over my own shoulder. As no-one walks in front of Eddie, it's perfectly safe.
The only time I carry my own rifle is when I'm doing a follow up and the it's in my hands.
All you need to do is get yourself an Eddie o Matic!