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Some of the things you have stated don't make scense? Are you measuring fired cases, full length reloaded cases, neck sized only cases or new unfired cases?
If these are unfired new cases then yes, the headspace measurements can vary. That is why we recommend resizing new brass.
If these are unfired reloads assuming they are the same brand case and you are sizing them all with the same die settings then they should measure about the same.
If these are fired cases from the same gun then they should meaure about the same. Some TC rifles have a gap between the barrel and the receiver. If you are shooting light reloads the case may not expand to fill that gap. Therefore there may be some variations is the headspace length.
1. Light loads where the case does not expand to fill that barrel gap.
2. Too much lube, dirt in the shellholder, no lube in the neck all can have an effect on the shoulders.
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