I had a partial rotator cuff tear my senior year of High School as I was tackling a fullback with one arm. I did rehab and worked out a lot but it has bothered me off and on for a long time (I am 37 yrs old). All of a sudden, my right shoulder has been killing me and it's a combination of picking up kids/sleeping the wrong way/shooting/yard work/etc/etc/etc.

Take a little time off and do stretching before you shoot. Also. get some 2-5lbs dumb bells for side arm raises and front rasies.

Good luck.

BOb