If you know alot about gun powder then u would know that the old black powder is made with nitrate and coal sometimes charcoal in real life but there are more advanced and more powerful powders that we use today so it would be nice to have those stronger powders so all bullets can be harder hitting especially the AP rounds. as for steel im sure yall know we have several types of steel such as fluid steel which is the black steel used on todays pump action and semi auto shotguns and the classic stainless steel which is the strongest steel and would be nice to see it return to the game. now I also mentioned titanium would be a good building material being the strongest metal in existence but stainless steel would be a good upgrade from regular steel until you can get enough titanium supply to make a truly indestructible base.