I'm not a doctor, but I did go through some repetitive damage in my heels when I was playing hockey. Bursitis is a problem that does not heal after rest. It's damage from repetition can be eased with lack of use, but it's a cumulative problem that never actually goes away, just calms down. Much like tendinitis. I separated my elbow in my teens and now have tendinitis in my right elbow. When it flares up my right arm is almost worthless for anything requiring strength or dexterity. Again it never heals and gets 100% better, it simply calms down.
The damage from shooting big guns like a 416 rigby are cumulative, and will cause damage which will show up as Bursitis or tendinitis and when it flares up you would want to feel the recoil of a .223 much less a big bore. I don't know a lot of people that this has happened to, but the two guys (both PH's)who do have this both have it from shooting a big rifle, one of them a 378 weatherby, the other a 500 Jeffery. Both loved to shoot them and were somewhat boastfull and proud that they could.
The fella Deon with the 378 Weatherby is now packing a 30/06 for most hunting and a 375HH for his DG backup work. The 375HH is now more then he can handle without stirring up some swelling and pain. The other fella is just crazy and still uses the 500 Jeffery for Backup work, but does not shoot it for practice. He's shooting a 308 for everything else as far as a I recall. These guys both shot the heck out of these guns, probably more then any normal person would. I had a 300 Weatherby at one time and would shoot it 100 times in a week. Several people told me the same thing about the bursitis risk. When the accuracy went south on me, I sold it to a guy that rebarreled it right away. Probably a good thing it was only a 300 weatherby, I might have done the same thing with a bigger gun at that age!