After cleaning, examine the shell to ascertain if it shows signs of rupture. These may generally be seen at the head, the mouth, or as transverse or longitudinal marks on the body. The shell is next forced into the die for resizing, using the mallet if necessary, striking fairly and squarely on the head of the shell, so as to avoid bending or distorting its flange. The outside of the shell or inside of the die should be oiled to facilitate the entrance of the shell and prevent abrasion. It is driven out by means of the punch inserted in the die and shell. This last operation is likely to cause a bur on the mouth of the shell, which would deface the bullet if not removed. For this purpose the scraper is supplied. Insert it about 0.5 into the shell, held in left hand, scraper in right; give the shell and scraper a half-turn in opposite directions, bearing with the scraper only hard enough to take off the bur. The handle of scraper and axis of shell should be kept nearly parallel to each other to avoid thinning the mouth of the shell. Although the shell may be fired several times without resizing, this operation is considered necessary after each round, otherwise the shell will be unduly expanded by successive rounds, and eventually fail to enter the gun-chamber; after which the extra force required to resize it might prove injurious to the metal.
Farrow, Edward S. American Small Arms; a Veritable Encyclopedia of Knowledge for Sportsmen and Military Men. New York: Bradford, 1904. Print.
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