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The Basics, Starting Out
blackened necks?
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<blockquote data-quote="JR" data-source="post: 54704" data-attributes="member: 1965"><p>What could be of help, sometimes what happens is the neck portion of your chamber is oversized...when the round is fired, the neck of the brass expands to the chamber, so if you have an oversized neck at the chamber, you will get less of a gas seal, hence possible insufficient pressures, and the blowback discolours the neck..Watch for case stretch, watch for thickness of the necks of your brass after firing...</p><p></p><p>Guy at work here had a similar problem with his 6.5 x 284, which we pinpointed to neck was oversized on the reamer(was an old reamer) than according to current Norma prints, was getting black necks, cracked necks, holes in necks, after 2 or three reloads..We ordered a reamer to Norma specs, rechambered barrel, and that problem disappeared with it..</p><p></p><p>JR</p></blockquote><p></p>
[QUOTE="JR, post: 54704, member: 1965"] What could be of help, sometimes what happens is the neck portion of your chamber is oversized...when the round is fired, the neck of the brass expands to the chamber, so if you have an oversized neck at the chamber, you will get less of a gas seal, hence possible insufficient pressures, and the blowback discolours the neck..Watch for case stretch, watch for thickness of the necks of your brass after firing... Guy at work here had a similar problem with his 6.5 x 284, which we pinpointed to neck was oversized on the reamer(was an old reamer) than according to current Norma prints, was getting black necks, cracked necks, holes in necks, after 2 or three reloads..We ordered a reamer to Norma specs, rechambered barrel, and that problem disappeared with it.. JR [/QUOTE]
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