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Long Range Hunting & Shooting
Christensen 28 Nosler (Pressure/Extractor)
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<blockquote data-quote="dok7mm" data-source="post: 1456144" data-attributes="member: 90080"><p>I bought a 280 ai for my son and had same problem with Nosler starting loads during barrel break-in. When I called, they told me the cratering was normal, because it had a beveled firing pin. Also they said the main spring was 22#. I replaced it with an 18# 700 spring and trimmed 1 coil off the ejector spring. That helped a lot, but still got cratered primers. It shoots @ 1/4 moa to 400, so the son likes it.</p><p></p><p>With the 22# firing pin spring, the bolt was very hard to open, after dry firing to set trigger pull, so that was one pressure indicator gone. Cratered primers, another gone! Heavy ejector spring smearing brass, that didn't help. It took a while to iron everything out, but I think I'll have Gre-Tan bush the FP hole and replace the firing pin.</p></blockquote><p></p>
[QUOTE="dok7mm, post: 1456144, member: 90080"] I bought a 280 ai for my son and had same problem with Nosler starting loads during barrel break-in. When I called, they told me the cratering was normal, because it had a beveled firing pin. Also they said the main spring was 22#. I replaced it with an 18# 700 spring and trimmed 1 coil off the ejector spring. That helped a lot, but still got cratered primers. It shoots @ 1/4 moa to 400, so the son likes it. With the 22# firing pin spring, the bolt was very hard to open, after dry firing to set trigger pull, so that was one pressure indicator gone. Cratered primers, another gone! Heavy ejector spring smearing brass, that didn't help. It took a while to iron everything out, but I think I'll have Gre-Tan bush the FP hole and replace the firing pin. [/QUOTE]
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Christensen 28 Nosler (Pressure/Extractor)
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