Most my guns were made in the 1800s with Damascus barrels. I'm not worried too much about being safe but at the same time see no reason to load at 10,000psi . My old guns don't have to cycle a shell so it's a more " comfortable feeling " if loads are around 8500psi. 100+ year old wooden stocks have the tendency to crack for various reasons and high recoil/pressure doesn't have to be one of them. Because I don't hunt anymore and just target shoot, 3/4, 7/8, or 1oz loads work just fine and over the years have used maybe 7 or 8 different powders to achieve good lower pressure loads. American Select, 700 and 800X, Promo, Red Dot, Green Dot, Nitro and Solo, just to name a few will all work.