MP;
I recall you having posted this before & is extremely good. I did question you before about the wt difference & know you said was by actual wt, but all else being equal one would expect a finer granulated powder to weigh more than a coarser one. Industry standard for a black powder measure is based on .115 CuIn per dram (27.34 grains). A CuIn of water weighs @ 253 grs, so the .115 CuIn would weigh 29.095 grs. This gives the dram of BP a density of 94%. A chart I copied off from somewhere many years ago, signed by Homer Powley, gave average bulk densities of a variety of smokeless powders as well as BP. It in fact listed 2FG Black as having a density of 94%, with 3Fg @ 98% & 4FG @ 100% so would seem the industry standard was based on 2FG. Black powder weights will of course vary a small amount from actual lot to lot. I cannot help but believe the lots you weighed varied in the man'f, perhaps a heavier wood for the charcoal etc, which caused the 2F to weigh more than the 3F rather than the granulation itself. Never-the-less this is still the best read I have ever seen upon black powder use IMO.
