This is a .38-55 case with the original overall length of 2.125" for use in .38-55's that are suited for longer cases (most firearms will accept this length). Wall thickness at the mouth averages .0072" which allows for use of a wider 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"
