Sleeping bag for Dall Hunt

So I believe it’s down to the Western Mountaineering Alpinlite, Badger MF and Versalite.
What temps is this good for?
I have one that’s rated to 20 degrees but they make them down to 0. I think mine weighs only about 20 oz. I’ve used it down to about 10 degrees and just added a layer of clothing underneath. Always take puffy jacket and pants for sitting and use them with my sleep system if it gets really cold.
check out feathered friends they make great bags/ puffies
Sea to summit Spark is a good down bag I bought one for the wife and prefer it over my mountain hardware ghost whisperer.
Arcteryx would be a good option for a puffy. I'm on year 5 with mine and I hunt stones every year in Northern BC
Go with a 20F/-7*C bag and a neoair x therm NXT sleeping pad