The .38-55 is the standard length of 2.080" which is the same as a Winchester case. Case mouth has thinnger walls (.0072" average thickness at mouth) than the Winchester case allowing for use of the wide variety of bullet diameters, especially in tight chamber/large bore situations.
For tips on choosing which length case to go with, click here to read our article "Loading with Correct 38-55 Winchester Cases"
