A guy I work with showed me these two brass for his 45-70. He bought the brass new and these cracked on the first shot. The head stamp is W-W. Has anyone got any idea what happened? Here's the info he gave me.
Marvin 1895 in gov 45-70
New brass only shot this once
CCI 200 primer
44g IMR 4198 powder
350g Hornady RN .458 bullet
38 out of 40 cases OK
Reload data from www.realguns.com/loads/45-70.htm
The crack in each case are about identical. Any ideas what happened?
If I do this right, here's a picture.