If the neoprene does not stretch (has a nylon strap on the back) they are fine. If they do stretch then they will bounce right off your shoulder. Aint worth a flip and a real pain in the arse.
I prefer the solid leather type that are wider at the shoulder and have a sewn in pad or the claw slings for synthetic stocked rifles.
http://cabelas.com/cabelas/en/templa...ainCatcat20712
http://cabelas.com/cabelas/en/templa...712&hasJS=true