You can buy a shooting vest with pockets to place gel packs in. MY wife uses one when she is shooting her shot gun on the clays course.
You can also add a good decent recoil reducing pad to the butt of the rifle.
https://kickeezproducts.com/
http://www.pachmayr.com/home/prefit-pads.php
You can also build a shooting bench that is portable, One shown is the booger bench if you do a internet search you should be able to find the plans. If not I have the sizes for the cuts and such stored.
I also built the wood rest for sighting in scopes as a protype for a metal one. The wood one with some minor changes worked so well I never did build a metal one.
Another thing is plan old home made cross sticks. I never go out coyote hunting with out a set. Best use for golf clubs I have found is to remove the shafts and make a set of cross sticks for prone shooting. Also use big rubber bands like found around asparagus to bind ski poles together to make a set of cross sticks.
https://www.prbullet.com/stix.htm
Found on varmint al's web site.

Al