I have a torn rotator cuff as well, it's not fun. Makes life difficult but can still do most things with no issues. It's al about the right exercises. Keep at it John!
I've always been really curious about just how much an affect changing primers on a load would have, and how it would impact accuracy. It'd be awesome to do a video testing it out.
Primers are part of the tune. Various brands and styles will change MV and peak pressure. So if you change them and change nothing else then you won't be seeing a true difference in primer performance unless you re-tune with the new primer. Makes valid testing hard to do. You can even see a difference when you weight sort primers of the same brand. Take the CCI BR4 for example. If you take ten of the lightest and shoot them against ten of the heaviest(they range from about 3.66-3.78gn) you will see a higher average MV with the heavier. In my testing it was up to 20fps.
Check @ your local academy store, if there’s one in your area. Here in South Texas, they’re plentiful I just bought 2000 primers last week @ $89 each plus tax.
