Here is a casting tool that came with the tools from Grandpa. The mold part is easy to understand but there are a lot of other holes too. Anyone ever seen something like this and know what all the openings and tools do?
The casting tool is pretty self explanatory. The molten lead goes into the mold cavity and you swing the door closed to get rid of the excess. When it's cooled off you open it and the bullet drops out. You will need to check all the equipment you have for casting because the molding part is the smallest part of it. You need a furnace to melt the lead and a luber/sizer to complete the process for a finished bullet. These items can be expensive even used.
Some Bullseye powder
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That is a pretty old canister of BE powder. I've loaded that powder for over 25 years and haven't seen a container like it so it's old. I would caution you not to use that because moisture may have gotten to it and degraded it. New bullseye can be had for $20-25lbs so I wouldnt chance that. Bullseye is also a fast burning powder which works great for light target loads but it isn't for everybody. If you want a powder to load both shot shells and .45acp, use Hogden Clays. 3.8-3.9 of Clays works well with a 200 gr lead SWC bullet in .45. There are several differnt versions of clays so use some caution there. You want plain Clays for the .45 and not Universal or International.
If possible, you might find it comforting to find an experienced reloader who lives near you to help get you set up. I've done that with a few acquaintances near me and have then been able to answer questions later as they come up. I have even taken them to some matches with me to show them what completion shooting is all about.
It's great that you want to use grandpas shotguns and equipment. That is a great honer to him. Enjoy those old doubles and shoot some rounds of trap for him.
John