Editing Swaging (section)

=== Firearms ===
In [[internal ballistics]], swaging describes the process of the [[bullet]] entering the barrel and being squeezed to conform to the [[rifling]].  Most [[firearm]] bullets are made slightly larger than the inside diameter of the rifling, so that they are swaged to engage the rifling and form a tight seal upon firing {{crossreference|(compare with [[obturation]])}}.

In [[ammunition]] manufacture, swaged bullets are bullets manufactured by compressing metal at [[room temperature]] into a die to form it into the shape of a bullet. The other common manufacturing method is [[Casting (metalworking)|casting]], which uses molten metals poured into a [[molding (process)|mold]]. Since metals expand when heated and contract when cooled, cast bullets must be cast with a mold slightly larger than the desired finish size, so that as the molten metal cools, it will harden at just the right point to shrink to the desired size. In contrast, swaged bullets, since they are formed at the temperature at which they will be used, can be formed in molds of the exact desired size. This means that swaged bullets are generally more precise than cast bullets. The swaging process also leads to fewer imperfections, since voids commonly found in casting would be pressed out in the swaging process. The swaging process in reference to cold flow of metals into bullets is the process not of squeezing the metals into smaller forms but rather pressing smaller thinner items to form into shorter and slightly wider shapes.

Individuals who make their own bullets usually are not aware of available manual specialized equipment and dies required for swaging bullets,{{citation needed|date=December 2017}} and thus choose to make [[cast bullet]]s. To get high precision results, it is common to cast the bullets slightly oversized, then swage the resulting castings through a die to do the final forming. Since the amount of pressure required to size the bullet is far less than that required to form a bullet, a simple mechanical press can be used, often the same press used for [[handloading]] ammunition.

All of the larger manufacturers of reloading equipment have abandoned making or marketing bullet swaging equipment due to the downturn in the popularity of the manual methods and the subsequent loss of sales. Currently there are only a few die makers who manufacture and market bullet swaging equipment. Four die and equipment makers, CH/4D, RCE, Corbin, and Custom Maker Kaine Dies, manufacture the bulk of bullet swaging equipment in the United States.