100 piece bag of factory new Winchester unprimed 22 Hornet (5.6 X 35 mm) brass rifle cartridge cases.
There are two bore diameters associated with the 22 Hornet, .223 in most riflesw prior to WWII and common .224 on more modern versions. Experiments conducted at Springfield Armory evolved into the Hornet, which is not similar to any current cartridge. Case walls are thin and easy to crush when reloading if the dies are not adjusted properly. The common twist is 1:16 so 40 and 45 grain bullets seem to work the best with slow pistol and fast rifle powders.
Brass case mouths MAY not be perfectly round from the manufacturing process, this can be corrected by running brass through the size die (always recommended) prior to loading. Residue from the annealing process may leave a stain on the case neck that can be removed by tumbling. Annealing involves rapid heating then cooling to impart the shell cases with the proper hardness to securely hold bullets in place and provides flexibility to expand and contract through multiple firings handloaders expect.