Working on a very old Stevens Tip-up which has both 14ga shotgun barrel and what appears to be a 38-45 heavy octagon barrel. The case dimensions vary from those in Handloaders's Manual of Cartridge Conversions. The chamber appears to be a mix of 38 Ballard Extra Long and Stevens 38-45. Bore is .364" coinciding with 38-45, but the head and rim more closely matches a Ballard. Not sure if the book is wrong, Steven's tolerances varied or what. Doesn't appear to be modified in any way and likely never shot. A 1876 Steven's manual mentions a 38-100 but I've never been able to pin down exactly what a 38-100 is. Can anyone tell me the rim diameter and head diameter of a actual 38-45 Stevens cartridge? Thanks, Dan