Believe me, it has been the grounds for many threads.This sounds like grounds for a whole new thread.
If the topic interests you and you'd like conclusive information based on measurements and scientific analysis rather than anecdotal "data" and speculation, look into purchasing a book called "The Glock in Competition" by Robin Taylor, et. al.
One chapter covers the subject of lead bullets and polygonal rifling in detail. That chapter was written by a licensed professional forensic engineer who fired literally thousands of bullets through Glocks with instrumentation monitoring the testing.