Cannoneer .,This particular cannon was made for me long ago by a company from Chehalis Washington ., called , Quali-Cast. They did alot of government work. 20% nickel ., 80% stainless . I have fired this one many times before the forum existed ., as in before I had a better idea of what not to do. I run much lighter loads now for a long time. And with many of my cannons I feel better doing that and have never had a problem. All of my cannons I got after being a board member ..., except this one. I am very surprised at how ignorant and lucky I have been. With that said ., this is my favorite and most trusted gun. It doesnt take BIG loads today ., but speaking of that ., lets just say its been proofed., a few times . No bulging ., no rust ., no pitting ., nothing.., perfect since the day it was bored. That was two days of slow turning and horrible screaming ., and many times sharpening the bit.