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Case volume
I noticed the same thing...that QL shows an OAL of 1.390" as opposed to 1.355". The volume listed at 24.95gn H2O, I would assume is based on the caliber designation of .300-221 in their drop down menu. In having compared the capacity of mil surp 5.56 to a necked up .221, I've found varying differences as much as a couple of grains.
I've never come to expect that great of accuracy from a newly formed case. Once you fire-form (fingerprint) the new brass any variations would be due to case wall thickness and should be minimal.
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Threaded Mode