I don't have the exact measurements but I know it's just a big 30-06 case. 5/3rd's a 30-06. I was looking for a 4/3rd's 30-06 case several years back for a wildcat I was thinking on and came across the 505 Gibbs case (needs necked down to be a true 4/3rd's) followed immediately by the 408 CheyTac.