See the posts on low pressure loads. Many trap and skeet loads of today are high on the pressure chart. When looking at modern trap or skeet target loads the pressures are probably over 9,000 and many times over 11,000 psi. I posted a link there to some reloading data that will include lower pressures. Even if you don't reload, read it and compare the pressures. I load 700x or 800x for my modern trap gun but would not put those loads in any of my LC Smiths.