Just a guess, but a relatively good one. I think that shot is probable not weighed during bagging. It is probably 'volumetrically' bagged. If it wasn't wouldn't high antimony shot bags have more shot in them?
I hear Neil's footsteps coming......................
I have a large supply of shot but the only scales I have that will weigh them are only accurate to around 1/2 pound. Because the size of the shot in the bags is not always the size of the shot stamped on the bags with some brands, I see no reason to expect the weight in the bags to be very accurate. A bag of #6 shot appears to me to have the same volume as a bag of #9 shot. The interesting, and a little complex, mathematical packing theory would not predict that 25 pounds of #6 shot in a bag would have the same volume as 25 pounds of #9 shot.
I just weighed a bag of Remington Mag. and a bag of Black Diamond shot on dig. scales supposedly accurate to 2 oz. They both weighed 25.4 lb. Bags would weigh a couple oz.'s. They are probably exactly 25lb. They aren't going to give any away.
What weighs more, an ounce of shot, or an ounce of gold? Yes, a trick question, but not in the way most people think.
As you well know EE, an ounce of gold weighs more!
Shot, being made of lead, is measured in avoirdupois ounces, and gold, being a precious metal, is measured in troy ounces. An avoirdupois ounce has 437.5 grains to the ounce while the troy ounce has 480 grains to the ounce. Thus a troy ounce is heavier than an avoirdupois ounce.
But a pound of shot is heavier than a pound of gold because an avoirdupois pound has 16 ounces while a troy pound has only 12. So a pound of lead weighs 7,000 grains while a pound of gold weighs 5,760 grains.
The law says an advertised weight on a product must weigh that much and usually a smidgeon more.
Beer Low power 3.2 cannot be over that amount, 6.0% beer cannot be over that amount because of the alcohol tax, same goes for whiskey. 6% beer must be over 3.2% but not over 6%. there is an ATF inspector at the brewery that has a tool to ck. this out, I have seen it a Bottler in New Jersey when I was applying for a job as Maint. Supervisor.