hi again,

i had a little time to play with the numbers. i attached a LibreOffice Calc spreadsheet. Not sure if you will be able to open it or not. It should open in Excel though. I'm showing that if you just use the stated density of lead, it wouldn't take much of a volume difference to explain the difference you have (7.2oz vs 7.02oz). It would only take a volume difference of 2.56%. if the object were a cube, the length of each side would only have to be off by 0.85%. given 'you are not going to mars', this seems reasonable to me. the spreadsheet might have errors. i didn't spend a lot of time checking it. the unit conversions were from a quick search of the internet and the density was from an even quicker search.

maybe the calculator will help some in the future though.

anthony

updated the spreadsheet 1; added some more info about typical scales. added some more notes. fixed formatting issues
updated the spreadsheet 2; added more info, comparisons, and calculators
updated the spreadsheet 3; added more comparisons

https://drive.proton.me/urls/TEB0GX5Z4M#vqxN6Xru2rf5

i'll leave the link active for a few months. i don't keep things stored there for too long, due to space constraints.