Purdey catalogues in my collection show a, 'Physical dimension chart,"showing a man with right arm raised, the picture identifies 8 dimensions to be measured and recorded. In addition height and weight of the shooter are requested. Opposite is a diagram of a sidelock shotgun with key dimensions shown.Unfortunately there is no relationship between the physical and required gun dimensions given. If of interest I would be pleased to mail you a copy of same.

Roy Hebbes