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Die sets are necessary for reloading bottleneck rifle and pistol cases. A full length die set includes a full length sizing die and a seater die. The sizing die will bump the case shoulder to the extent it is adjusted up or down in the press. It is recommended to use a cartridge headspace gage tool to ensure the correct shoulder bump. The sizing die also sizes the case body for easy chambering during the next firing, and it decaps the spent primer. The expander ball passes through the neck of the case to size it to the correct tension. Before using full length sizing, cases must be lubricated.

Bottleneck seater dies are used to seat bullets correctly in full length or neck-sized cases. They have a built-in crimp ring that enables crimping of the case into the bullet if desired. Adjusting the die position in the press allows for easy adjustment of crimping or non-crimping.

Full length 2 die sets are an essential part of the reloading process. Many shooters wear out multiple barrels or rifles using just one full length reloading die set. It is recommended that new reloaders start with a full length die set and learn how to set up the dies properly before moving on to other types of reloading dies.