About 30 or 40 years ago, I made my bags from blue jean legs……stitch across one end, fill bag with sand, stitch closed.
I don't shot nearly as much as many of you, but with a little care mine have lasted quite well.
I use an "elcheapo" adjustable front rest, and leather "rabbit ear" type rear. I put bags beneath the rear "rabbit ear" bag as needed for proper height. For rear height "fine tuning" I merely pinch the sand bag for height increase or nestle the rifle a bit deeper into the bag to lower.
If it's already perfectly clear……this is the "poor boy - red neck" setup!
But, it seems to work for me!
Addendum: I also use a volley ball elbow pad on the bench arm, I found out the hard way that after a few shots…..a lot of skin was left on the bench after firing a few rounds. The burning pain is rather distracting!
memtb