Digging through the safe, I found 30 rounds of 38-40 ammo, loaded with 37 grains (volume) of Triple 7 and a 180 grain bullet. Since I have not had a 38-40 in about 10 years, I decided they were excess to my needs. What I do have is 44-40s, and never enough brass. My 44-40 Armi san Marco/EMF 1873 clone and I took a walk in the woods with the 38-40 rounds. I fired all 30 and created 30 new 44-40 cases, (well actually 28, as two of the cases older ones with many reloads under their belt split). The rest, however, formed into 44-40 cases perfectly. What is funny is the fact that I hit whatever I aimed at, even though the bullets were .027" undersized. I guess they cruised down the barrel like a ball down a smooth bore.