I've found only two loading manuals by different bullet makers, which seem to be the only ones still making bullets for a .405 Win (.411-inch diameter). I also own a Marlin 45-70. The two manuals (Hornady and Barnes) give several different, progressively hotter loads for the .45-70, depending on what type of rifle you're using. The old trapdoor Springfield gets less powder than the Marlin 1895, which in turn maxes out with less powder than the loads developed for a Ruger No 1. The No. 1 has a stronger action that can withstand greater pressure. My new .405 Win is a Ruger No. 1. All of the .405 data by Barnes and Hornady were from testing a lever-action, specifically a Winchester 1895, which I don't believe is even as strong as the Marlin. It seems to me that the stronger Ruger action should be able to withstand greater pressure than a Win 1895. Yet neither bullet-maker has published any enhanced loads for .405 fired in the Ruger No. 1. Wouldn't it be possible to safely develop enhanced .405 loads to take full advantage of the Ruger's strong action? I am thinking of using the .45-70 variations as a rough guide for how much more powder to add, while of course keeping alert to the usual signs of excessive pressure.