OK, let me throw a clinker into the sling mix.
Back aways. used to use a wide leather sling when I was hunting open country where the rifle spent much time in the shoulder just being carried. But be'in an Ol'Coot with shoulders and arms that don't like to have things carried by hand, long term, and now hunting much closer cover with the need for a quickly ready rifle. I needed to look for better options.
Gave a rifle to my son because of weight and the others were still a problem.
ANSWER, the Safari or Boonie sling which is a front, across the body sling.
This has solved almost all the carry/weight problems, and is EXTREEMLY fast to put the rifle into action.
I have used this sling for close to 10 years, and only use the typical over the shoulder type for short carry situations.
Keep em coming!
Crusty Deary Ol'Coot