I have a large NPE shotshell with the following dimensions:
Rim Diameter - 1.693"
Head Diameter -1.558"
Body Diameter -1.530"
Length - 6.50"
The body is tan paper. The primer is copper and flat. The rim or cup that the primer sits in is broken away like I have seen on older Eley / Kynoch shotshells. There is no trace of a headstamp. Is this enough info to ascertain the gauge? Thanks!