in a 6x8x6 foot loft pigeons 

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in a 6x8x6 foot loft pigeons
2ft² floor space per bird.
If the foot print is 42 ft² I would say 21 Pigeons +or -
If the foot print is 36 ft² I would say 18 pigeons +or -
If you have much more than that per square foot I think you are looking for problems with over crowding and disease. Size and temperament of birds have to be factored in as well.
what about cubic You have 384 ft³ at 10ft³ per bird it is going to give you 38 pigeons.