The fact that (what I assume is factory) brass is not min spec is not unusual.
If your brass is LONGER than min, that is not a tight chamber.
SAAMI max OAL for cases is: 2.015"
SAAMI min is: 2.005"
Trim your brass. IF your brass is longer than SAAMI max, AND you aren't interfering with the expansion, meaning the chamber is larger than spec; you either have a "out of spec" barrel from the factory; or the more likely culprit is that the gun had previously been shot with hot loads(or a ton of rounds) and it has been stretched, or worn loose. Overpressure loads will open up headspace with relative ease.
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