The best book of this scope I am aware of is Burrard's "The Modern Shotgun". It is of course not Modern today. I highly suspect Burrard was "Finacially Comfortable", Had a great interest in the Shotgun & it's ballistics & devoted himself to this work & never received a commpensation equal to his expenditure in producing it. This is a combination which does not happen just every day of the week, so may well be a long time before an equal, more modern work is produced. So many of it's principals are however so still applicable one is not really hindered that much if they posses it.
