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THe reason you see such variation, especially for 9mm Luger, is that the chamber is designed for a very long tapered FMJ bullet. If you load a similar bullet then you can load out toward the max COL.
The issue is when you load a blunt nose bullet such as a HP or FP. If you load them long like that the bullet tip will wedge into the pointy end of the chamber. I just loaded some new Berry's 124 gr HP ulelts and the max length I could get with easy chamber was 1.070", where as with lead round nose I can easily load out to 1.150" (COL max is 1.169").
I was playing around with QuickLoad and various COL, and it did not seem to make difference in pressure from 1.150" to 1.110", but under 1.100" the pressure started to rise significantly for each 0.010" decrease.
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