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I believe this ammo is no longer produced. I was lucky enough to get the last box from my local gun store a few years ago. Testing with the Ruger LCR in water jugs I found that it penetrated 24+ inches (4 water jugs) through 2 layers of denim and expanded to .51". Most likely the reason Speer discontinued this particular round is the over penetration. I load it for self defense as the last round in the cylinder.