
01-25-2013, 05:07 AM
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Beartooth Regular
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Join Date: Jul 2005
Posts: 165
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.303 case life.
The trick to getting good case life when reloading a rimmed cartridge that is to be used for the same rifle all the time, is to only neck size. A rimmed cartridge will be fire formed to your guns exact chamber the first time it is fired in that gun. The shoulder will be stretched forward to fill the chamber. Unlike a rimless cartridge that locates on the shoulder. A rimmed cartridge locates on the rim so shoulder length never needs to be pushed back if Fired in that same chamber. Full length sizing is unnecessary and pushes back the shoulder each time and when fired that shoulder again stretches forward, causing a thinning of the brass and a much earlier failure of the case then if only neck sized. The cartridge if often more accurate if only neck sized because it is already a perfect fit for your chamber.
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