I use a crossbow and plan on connecting it and my backpack to my rappel rope before I start climbing up and then pull up my stuff with the rappel rope. I might look for a dump pouch that I can put the stock of the xbow in and then loop the rappel rope through the front stirrup. Could probably connect the rope to the stirrup and then tie a loop around the stock to pull up that way as well. My xbow can quietly cock and decock in the tree.
For a shotgun/rifle, I recently ordered one of these from amazon:
I might cut off the strap and sew in a loop for a carabiner so I can connect this to my rappel rope.
I like the idea of the rappel rope because it’s thicker and more comfortable to pull up than paracord or something thinner. The wide strap on the third hand sling would be easy as well but is another cord to bring. Thus the desire for using the rappel rope. I ordered a Doyle’s from amazon (webbing version) and it was nice but it seemed heavy for what it was and the strap was about 1/4 inch so I decided to return it and go with the rappel rope. I like the idea of using the rappel rope for multiple uses.