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Rifles, Reloading, Optics, Equipment
Reloading
What happened to my load?!
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<blockquote data-quote="brentc" data-source="post: 1755073" data-attributes="member: 16938"><p>What brand of brass are you using? If it's anything other than Norma or Nosler, you're probably over pressure at 77 grains with fired brass in a SAAMI chamber. There is a significant case capacity difference between virgin and fired brass in belted mags. On a 300 WM the shoulder will move forward .016"+ from a virgin to fired case due to headspacing off the belt on the first firing. After the first firing with a properly sized case you will headspace off the shoulder just like a non belted case. Over pressure is often masked if you worked up your load with virgin brass.</p><p></p><p>Back it down to the next node in fired brass, which should be around 75 grains.</p></blockquote><p></p>
[QUOTE="brentc, post: 1755073, member: 16938"] What brand of brass are you using? If it's anything other than Norma or Nosler, you're probably over pressure at 77 grains with fired brass in a SAAMI chamber. There is a significant case capacity difference between virgin and fired brass in belted mags. On a 300 WM the shoulder will move forward .016"+ from a virgin to fired case due to headspacing off the belt on the first firing. After the first firing with a properly sized case you will headspace off the shoulder just like a non belted case. Over pressure is often masked if you worked up your load with virgin brass. Back it down to the next node in fired brass, which should be around 75 grains. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
What happened to my load?!
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