I have two hobbies. Shooting and reloading. The more I do of one the more I can do of the other.
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Hoss #17 there is no length really for the gauges as the 303 headspaces on the rim of the cartridge once you have fire formed the brass (For that particular 303 rifle) you should only have neck size them and after 3-4 reloads FLS them but always try an empty case after neck sizing to ensure the shoulder has not moved forward to much making it hard to chamber although keep an eye on the case lengths they do stretch a bit measure them each time.