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Rifles, Reloading, Optics, Equipment
Reloading
Need Help....Heavy Powder Residue On Case...
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<blockquote data-quote="dok7mm" data-source="post: 1117090" data-attributes="member: 90080"><p>I had this same problem [ for the first time ever ] on my son's 7mm RUM a while back. After a lot of head-scratching, I found it to be the amount of reduction in neck diameter of brass fired in his chamber - .319 nk. - to the .313" bushing I was using for .002 neck tension on 168 Berger Classic Hunters. It finally dawned on me and I checked some more brass by resizing 10 more pieces of the new Nosler brass I was fire forming. Six outa ten had necks measuring .002" less than my target neck of .313". Basically, my one stage reduction was giving me .004-.005 neck tension and coupled with the different case neck thickness of the high $$$ Nosler brass, the case necks were not sealing consistently. To prove my theory, I changed to a two step bushing setup using first a .306 bushing, then my final .313 bushing, while measuring case neck diameter after each step. Perfect, I sailed thru the rest of the brass with no more sooty cases. You didn't mention your die set-up or fired case neck diameter, so this may not apply to your situation. +1 on the possibility it is a headspace issue.</p></blockquote><p></p>
[QUOTE="dok7mm, post: 1117090, member: 90080"] I had this same problem [ for the first time ever ] on my son's 7mm RUM a while back. After a lot of head-scratching, I found it to be the amount of reduction in neck diameter of brass fired in his chamber - .319 nk. - to the .313" bushing I was using for .002 neck tension on 168 Berger Classic Hunters. It finally dawned on me and I checked some more brass by resizing 10 more pieces of the new Nosler brass I was fire forming. Six outa ten had necks measuring .002" less than my target neck of .313". Basically, my one stage reduction was giving me .004-.005 neck tension and coupled with the different case neck thickness of the high $$$ Nosler brass, the case necks were not sealing consistently. To prove my theory, I changed to a two step bushing setup using first a .306 bushing, then my final .313 bushing, while measuring case neck diameter after each step. Perfect, I sailed thru the rest of the brass with no more sooty cases. You didn't mention your die set-up or fired case neck diameter, so this may not apply to your situation. +1 on the possibility it is a headspace issue. [/QUOTE]
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Reloading
Need Help....Heavy Powder Residue On Case...
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