The outside frames on a 10 frame hive typically are difficult to fill  out. 
 This follows from looking at a wild bee nest.  The outside combs  are 
smaller than the inside combs due to the "round" nature of the nest.   Hence,  I 
would bet that the inside combs are about the size of an 8 frame  hive with 
each outside frames of a 10 frame hive being the smaller outside combs  of 
a wild nest.  A wild nest varies in size so some probably do not utilize  
the outside frames of a 10 frame hive.  I believe Langstroth knew this and  
made his hive 10 frames with each outside  frame for the variance of the  wild 
nest size.

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