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It seems more .45 caliber pistols have match grade type chambers/barrels then 9 mm pistols to. Most 9 mm pistols are combat grade. From what I've seen combat grade chambers have a looser fit for the ammo. This should allow a greater deviation in the bullet and still feed. Accuracy might suffer but in a combat pistol reliability is more important.
Tight chambers on .45 pistols tend to lead to feed problems from what I have seen. It might be why as a .45 pistol is shot more without cleaning the odds of a jam increase equal to the amount of carbon in the chamber.
This might explain why one caliber might seem to be more reliable then the other to some people. I am not an expert but, I might have learned a little bit over the years.
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