I think I got tired of using my pack and that led to me shooting off of my elbows. Basically flop on the ground and shoot with no rear rest.Back in 2015 - 2016, I was obsessed with shooting light-ish rifles off of my pack. Tikka SL 300 WM, then a Kimber 84M 7mm-08.
I did fair out to ~300. At ~400, I might get one out of three shots on steel. Not great but a lot of fun.!
Now I just snap the Spartan bipod on, and use my chest purse for a rear rest