It depends. If you gain altitude by getting on a mountain, you can actually gain weight. The solid rock is denser than loose earth or water, so its greater mass raises the gravitational field. If you want to go where you'll weigh least, get a boat to take you out over the Mariana Trench. Water is less dense than rock and there is a lot of it under you there, so you have a less intense gravitational field.
That said, electronic scales and spring measure weight (how much force a given mass presses down on a scale in a gravitational field) while balances measure mass. If you go the moon, the electronic scale will say your bullet weighs less unless you recalibrate it for the moon). But a balance will still say you have the same bullet weight because it is balancing mass on one side of the balance point against a mass on the other. Both masses will lose the same amount of weight going to the moon, so they will still balance against each other at zero.
Mass (the physical and not the religious kind) has units of slugs in the Avoirdupois system. A slug is the amount of mass 1 lb of force accelerates at a rate of 1 ft/s².
The Avoirdupois system of measure uses pounds for force and for weight and has slugs for mass.
The metric MKS system has mass and weight in the same units, kilograms, but force is a separate unit, the Newton. One Newton of force accelerates a mass of one kilogram at a rate of 1 m/s².
All European and other CIP countries use grams for bullet and charge weights. The resolution for charge weight is usually 0.01 grams or about 0.15432358 grains in European load data.
Nube,
There really isn't anything here for you to determine unless you intend to substitute yourself for the international standards and measures organizations. These organizations tell us there are 7000 grains in a pound, but only 453.59237 grams in a pound. How much bigger is 7000 than 453.59237? 15.432358 times bigger. Hence, that is how many grains there are in a gram.
Cardinal Numbers, according to Merriam Webster:
cardinal number, noun
Definition of cardinal number
1 : a number (such as 1, 5, 15) that is used in simple counting and that indicates how many elements there are in an assemblage — see Table of Numbers
2 : the property that a mathematical set has in common with all sets that can be put in one-to-one correspondence with it.
It's the correspondence between a check weight and scale reading that follows the second definition of being a cardinal number.
