Blair
There were some small lead flakes in the powder. I picked out most of the larger flakes, but a few small ones did remain. I haven't tried to measure it by bulk, but I suspect it will be closer to 45gr. There is probably a little fulminited mercury mixed in too.
Here is the Leet, 1.623" length next to my .50-45, 1.687" length.
I no longer have the chamber cast, that was many years ago. But from my notes, the chamber is 1.400" long.
I used a kinetic bullet puller. I felt almost certain the priming compound was dead. But I made sure the case was held firm in the puller, not able to shake around and bang the rim. I did it outside with a faceshield and protective gear. It came out quite easy. That thin, soft copper crimp gave way with little difficulty. Then I had to dig out the compressed powder.