Re: Shoulder problems - need prone help
A few thoughts...
I would suggest that you minimize recoil with a smaller caliber, extra weight, and a muzzle break or suppressor.
Get a good stock with an adjustable cheek piece and length of pull.
A good trigger will ease tension and strain.
Optics that permit extra eye releif and with excellent optical quality and magnification will also cut down on strain.
Switch from right to left hand or vice-versa if that makes it more comfortable for you.
If you have the option to do so, shooting from a burm with your feet and body slightly below the rifle may cause less stress on your neck and back.
NRA high power shooters wear a shooting jacket. I've never used one. But, they may be able to comment on whether that would help you for shooting prone.
Hope this helps.