You make this too easy.
4 consecutive responses from 6.54 PM. to 7:24 P.M. With an edit at 7:19 P.M.
You weld up the hole in your bottom pour pot, then show us a picture and complain About not being able to get those last 2 lbs. of lead out of the pot with your dipper???
I would suggest that you take R.M.'s advice, but I don't want you firing shots at him, Too! So, I will simply concur with R.M. by suggesting that you put the sprues back in the pot as you are going along, and that will extend your casting time.
I learned to pour my "feeder " lead for my pot by making grooves with a finger in the flower bed, then letting the ground dry before pouring the "sticks", they were/are about 3/8-1/2" in width, and about 8 inches long. I can stick them into a pot that is half filled with molten lead, and they melt down much quicker than If I put in larger chunks. That gets me back up to Temperature, and casting again. To clear the pot at the end of a casting session, I simply pour the remaining lead into molds held under the pot, after turning off the machine. I occasionally get a bit of lead sitting on one side of the bottom or the other, but it weighs less than the sprues I add to the pot. When everything is cooled down, I upend the pot, SAFELY, NOW, and dump the bits of lead onto the top of the molded lead pieces.
To start a cast, I first melt a couple of my thin sticks, then begin adding the one and two pound ingots. The melted lead helps speed the heating of the ingots to melt them.
Like you, I don't know many people who enjoy sitting around waiting for lead to melt.
Good luck to you. :thumbsup: