Some remarks on Scoville ratings from my understanding:
1.) It is often very subjective, based on the (often non)consensus of of experienced chiliheads by comparison with other chilies they eat/have eaten from memory.
2.) claims are generally based on the maxima. Growers, breeders and etc. will tend to want other chiliheads to try their hottest chilies from their best crops, particularly when promoting a variety for it's heat.
3.) the heat for a given variety varies widely, and will overlap substantially.
With this in mind, your bhut jolokia may be hotter than my carolina reaper, or as comparatively mild as my habanero, from one specimen or season to another.
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