Is it because a stiff bolt requires more force to open and that then smooshes the bag into a different shape? And that’s a problem? Why not just smoosh it back into shape? Or fill it up more so that it’s more dense and doesn’t lose shape so easily.
This is weird. I’ve shot thousands and thousands of rounds off of a bench and in all manner of shooting positions. I have never once given a second thought to distorting the shape of my shooting bag. And I certainly haven’t drawn connections between my reloading process and the shape of my shooting bags!