Interesting discovery

gregoryhart1

September 26, 2010 14:22

Today while reloading some .357 rounds I decided to measure the length of fired brass before & after sizing. I was very surprised to discover sizing increased the length about .004". It stands to reason that increasing the diameter through firing would shorten the length, I was just surprised how drastic the difference was.
GH1[:)]

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  76k20

  September 26, 2010 16:39

  I have similar experience with 300 Win Mag. Fired cases were about .003" shorter than full length sized cases. A good reason to trim brass after sizing to ensure correct OAL during the loading process.

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  gregoryhart1

  September 28, 2010 14:40

  Fortunately I didn't need to trim mine, after sizing they fell right in the specified range.
  GH1[:)]

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