I'm working through some issues with a spinal cord injury (SCI) and reduced function/ROM in my left (gun) hand.
My strength is in the toilet, so I am mainly shooting pistol. 5 round groups otherwise the gun gets too heavy and they start wandering around the target. Lack of wrist function (ulnar deviation in particular) makes it difficult to lock the wrist over center for muzzle control. Lack of grip strength makes shooting consistently difficult. Shortened connective tissues in my hand and fingers means I have to really be diligent about stretching and pointing my trigger finger to mount the trigger properly so I don't "push" shots. I also found I was way too high on the trigger, requiring more pressure to engage the shot. I work harder now to get lower on the shoe and my consistency has improved.
This past fall and winter I started shooting trap with a 20ga pump gun and I really enjoyed it. Part of the reason for a 20 was reduced weight and reduced recoil. Even at 6ish pounds, I've found I have to rest the butt on my knee while the squad is shooting or my shoulders and arms get tired holding the gun. One big issue I had finding a shotgun that worked for me is the lack of ulnar deviation in my left wrist, mentioned above. Traditional stocks with their swept pistol grips are difficult, to not possible, for me to grip properly while being able to extend my trigger finger to the trigger. Shooting in the fall and winter cold makes it a lot harder to use my hands, they just don't work, so I have to keep them warm. 3 rounds of trap is about my practical limit.
Rifle shooting is sitting from bench only. I tried standing with hasty sling but couldn't keep the sights on target, even with a hunting rifle. Sitting, I have the same wrist and hand issues that affect pistol and shotgunning. I currently shoot a .270 and .243 Win and to be honest the recoil kind of beats me up. I'm putting together a .223 to hopefully get around this. I want to do positional shooting but am limited in prone with the neck/spine extension required. I can only play like 4 games of pool at a stretch for the same reason.
So, it's difficult. I keep working on my hands, keep working on my neck and they've been improving little by little. Around this time 1yr ago I don't think I was able to shoot a 9mm, so it's been improving. Hopefully I can start lifting again soon and I think that is really going to get things moving.