10,000 rounds is nothing as far as wear of the non-spring parts. My experience is that POI shifts when ammo, springs, grip pressure, sun direction, altitude, etc. changes. Here is what would happen to me if I went from a seasoned 11 lb to a new 13 lb spring--The POI would drop a little, the recoil changes, so my timing on the shot sequences changes. I would get rattled after seeing the results and make things worse. Then it is decision time. Do I adjust the sights and re-learn and refine my technique with the 13 lb springs or do I go back to the 11?
Run and gun folks tend to want to run as light a recoil spring as possible in their pistols. Bullseye and precision shooters tend to (or should) run as strong a spring as they can and still get the gun to cycle with whatever ammo they standardize on. The stronger springs generally help use up as much dwell time as possible and gets the barrel back in to the same lock up position as you had on the first shot, but the guns are more difficult to chamber and aren't as fun to play with or dry fire any more.
I can't handle variations in the shooter (medications, eyesight, attitude, back pain level), much less in the pistol or ammo, so I tend to do a lot of experimentation early on and then never change the gun physically after that and I adapt to it. When I see a change in POI now, it is me, not the gun. For example, after missing a few weeks of shooting with the Kadet, I may shoot an inch or two right for the first 25 yard target or two standing single hand. It is my grip strength. I tighten up on the grip and the POI shifts left slightly, back to where it should be. I changed my glasses prescription a few weeks ago and had to make a small adjustment one or two clicks on each of my bullseye guns because the dot shape got clearer and smaller than before. In the winter, I expect to see a POI change if the ammo isn't kept warm. Even gloves vs no gloves will change things.
This is fun. This is not easy.
Joe
