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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
BARREL VELOCITY (SS vs CM)
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<blockquote data-quote="tim_w" data-source="post: 1041282" data-attributes="member: 11132"><p>First these were all AR barrels. We had barrels pulled with the same button in both 4150 CM and 416 SS and chambers wers cut with the same reamer as well (to the same headspace using the same set of gauges. We tended to see higher vel especially when new from the SS than CM. This did not suprise us as we tended to always see more copper streak fouling in the CM. If we handlapped the CM to the same finish which took 2x as long vel seemed to be very close. We ended up going to chrome lined for the CM and offering the SS as marketed more towards higher accuracy becuase of the history of CL effect on accuracy. This ended the apples to apples comparison. </p><p></p><p>I will add that soon after based on research and testing we switched over to nitrocarborizing with a qpqp process (q=quench p=polish) with the bore and chamber final polish done by hand as the media was not very effective in the small diameter space of the bore. With that change it ended any differences other than CM tends to be tougher. Given the choice I would always have my barrels melonited/nitrocarborized.</p></blockquote><p></p>
[QUOTE="tim_w, post: 1041282, member: 11132"] First these were all AR barrels. We had barrels pulled with the same button in both 4150 CM and 416 SS and chambers wers cut with the same reamer as well (to the same headspace using the same set of gauges. We tended to see higher vel especially when new from the SS than CM. This did not suprise us as we tended to always see more copper streak fouling in the CM. If we handlapped the CM to the same finish which took 2x as long vel seemed to be very close. We ended up going to chrome lined for the CM and offering the SS as marketed more towards higher accuracy becuase of the history of CL effect on accuracy. This ended the apples to apples comparison. I will add that soon after based on research and testing we switched over to nitrocarborizing with a qpqp process (q=quench p=polish) with the bore and chamber final polish done by hand as the media was not very effective in the small diameter space of the bore. With that change it ended any differences other than CM tends to be tougher. Given the choice I would always have my barrels melonited/nitrocarborized. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
BARREL VELOCITY (SS vs CM)
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