hi burrman,

it sounds like the variability is with the density. density is mass / volume. so you are on the right track. to get mass take the weight (that you measured) and divide by gravity. to get density, take the mass and divide by the volume of the part. once you have calculated what the density is for that particular batch, you can then make any future calculations with the new density value. hope that makes sense.

density = mass / volume

weight = mass * gravity

like Frenchy may have been alluding to, using metric units will prevent errors. you can use unit conversions, on the inputs and outputs, to work with english units. i don't think you need to worry about the difference. just focus on what the actual density is, for the particular batch of lead you are working with. you can use the same procedure to find the density for any given batch.

anthony