We have a choice between 9mm, .40, and .45. Most officers are using .40, but in the Sig I prefer 9mm. I'm a better shooter with the P220 .45, so I've been using that lately.
The wear factor has more to do with abuse on small parts. When the slide cycles, it slams harder to the rear putting greater impact on the frame insert and slide rails. This in turn puts more stress on the take down lever, roll pins, frame, and wears out the locking lugs of the barrel. So, even if you replace the small parts over time, the mating surfaces of the pistol will open up and cause function and accuracy problems. Even on a Glock, this would put additional stress on the frame rail inserts(flex or not), and greater impact on the barrel and frame insert surfaces. You are right though that in general the Glock handles it better.
The 127gr load doesn't do any better than any other 9mm loads against windshields. The problem is that the hard windshield materials rips apart the bullet and turns it into fragments causing shallow penetration. Usually, the faster the bullet travels the more violent the bullet breakup. A 147gr Ranger Talon tends to do a little better against windshields than the 127gr load because it has greater momentum and mass to keep it penetrating. The only way to really make the bullet do better is to make its construction more robust so that it stays together better. Bonded bullets are an improvement.
Check out Winchester's "Launch Testing Comparison Tool" and you will get a better idea of how each load performs:
http://www.winchester.com/Products/l...n-testing.aspx
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