<prompt> Spherical lead balls that can be made from one pound of lead for a 12 bore shotgun: Manipal 09681224  <response>: Ans. 12 The gauge of a firearm is a unit of measurement used to express the inner diameter bore diameter of the barrel. The gauge of firearms is determined by 1 pound gauge weight of lead sphere. weight of a solid sphere of lead that will fit the bore of the firearm and is expressed as the multiplicative inverse of the spheres weight as a fraction of a pound. Thus there are twelve 12-gauge balls per pound 