I realize that there are a ton of variables involved, but I'm looking for some math and science instead of just copying prior art. The project(s) is a high powered air rifle, and I need to be able to determine what tubing wall thickness will allow how much pressure. I realize that alloy is important, if it makes it simpler, assume 4130. And tube diameter most likely around 1", and will certainly NOT exceed 2". My goal is a working pressure of 3000 PSI, as that's pretty much a standard in the airgun world. End treatments will be threaded, which I'm aware will also have an impact on wall thickness required. Any help would be much appreciated.