Anecdotally, proper sling usage makes a huge difference with the larger cartridge battle rifles. The sling needs to be wrapped around your off-arm tightly and

Anecdotally, proper sling usage makes a huge difference with the larger cartridge battle rifles. The sling needs to be wrapped around your off-arm tightly and seriously pull the rifle into your shoulder, which substantially helps to mitigate the recoil knocking it off its aim. Yes, your shoulder is still gonna be taking a bruising, but that's the much better end of the rifle to be on.