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The Lee-Enfield's rear-locking feature is often blamed for poor case life by handloaders who experience difficulty in trying to reload for the .303. Actually, the Lee-Enfield action is entirely adequate for the usual working pressures of .303 factory loads, generally around 40-45,000 c.u.p., and poor case life is commonly a result of excessive cold-working of the brass in resizing.
 
The Lee-Enfield's rear-locking feature is often blamed for poor case life by handloaders who experience difficulty in trying to reload for the .303. Actually, the Lee-Enfield action is entirely adequate for the usual working pressures of .303 factory loads, generally around 40-45,000 c.u.p., and poor case life is commonly a result of excessive cold-working of the brass in resizing.
  
The cold working occurs because military .303 chambers feature a clearance of about 1/16" between the cartridge case shoulder and the rifle chamber, put there to ensure the rifles would function with dirty ammunition under harsh combat conditions that could include mud, sand, and dust. Because the .303 British headspaces on the case rim, rather than the shoulder like the .30-06, this shoulder clearance is inconsequential to headspacing. However serviceable headspace may allow stretch in the web area, reloaders may want to use the o-ring trick for the first firing to fireform the case, improving case life"https://www.milsurps.com/content.php?r=296-Headspace-101-for-.303-s" using a 10x1mm o ring rolled onto the cartridge, will center the case, and take up any excess headspace
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The cold working occurs because military .303 chambers feature a clearance of about 1/16" between the cartridge case shoulder and the rifle chamber, put there to ensure the rifles would function with dirty ammunition under harsh combat conditions that could include mud, sand, and dust. Because the .303 British headspaces on the case rim, rather than the shoulder like the .30-06, this shoulder clearance is inconsequential to headspacing. However serviceable headspace may allow stretch in the web area, reloaders may want to use the o-ring trick for the first firing to fireform the case, improving case life"https://www.milsurps.com/content.php?r=296-Headspace-101-for-.303-s"
  
 
But this clearance does result in the .303's case shoulder being blown forward upon firing. If fired cases are then full-length resized in the usual way (with the die adjusted so as to contact the shell holder), excessive cold working of the case shoulder eventually weakens the brass, with resulting casehead separations.
 
But this clearance does result in the .303's case shoulder being blown forward upon firing. If fired cases are then full-length resized in the usual way (with the die adjusted so as to contact the shell holder), excessive cold working of the case shoulder eventually weakens the brass, with resulting casehead separations.

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