richardw, I'm going to approach your problem differently from everyone else. Instead of suggesting a change of caliber, I'm going to suggest a change in statins. I am 73, and a year ago, I was in the same situation you are in. I'd developed lots of pain in my shoulders which spread to my wrists and hands. I had to install an Apex kit in my M&P 40 so I could pull the trigger. I could barely lift my range bag. My Harvard med school trained hand doctor said he'd never seen a case like mine, and wasn't sure what was wrong. I didn't fit into any traditional arthritis category.
Subsequently, my primary care physician's nurse practitioner hypothesized I was having a reaction to atorvastatin (generic Lipitor), and told me to stop taking it. I told her I'd been taking 40 mg per day for 15 years without a single side effect. She said give it a try, so I did. I stated feeling better after a week, and after a month, all of my shoulder pain and 90% of my wrist and hand pain were gone. My cardiologist then prescribed a low dose (10 mg) of rosuvastatin (generic Crestor), which has controlled my cholesterol as well as the atorvastatin did, with no side effects.
As a result, I can now shoot what I want. Today, I went to the range and fired 150 rounds of .45, and 100 rounds of .40 with no problems. If your situation is anything like mine, you might want to check your statin to see if it might be the culprit. However, if you are one of the 1% of the people in our age group who is not taking a statin, good for you, and... never mind!