I did this LOOOONG before cowboy spl came about. I didn't want to throw away split cases. So I 1st cut them back to .45 schofield length and then decided to cut them back to .45 acp length so I could just use my .45 ACP dies. I made a jig to cut 10 at a time, and used a small band saw. I don't shoot .45's at this time but have around 1000 to 1200 loaded rounds plus empties. I have never used cowboy special cases.