Bob,

Thanks for the help. I want a "standard" 8 bore 3.250" chamber. The barrel is rifled with a standard .835 bore dimension. I have been down the road of special brass cases for bores of over .860", but this will not be necessary here. I have feelers out now with several of the reamer companies but it is a new project for all that I have contacted so far.

Below is a link with some good data.
JZ

http://www.dave-cushman.net/shot/shotshellloads.html