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Old 09-04-2017, 05:43 PM
JWCF

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STUPID Question...



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And i expect stupid replies :-) Just kidding....

But seriously, CZ sent me another .17 fluted barrel for my 455 V, and after several rounds there was a light buildup of brass on the bolt face, a nice shiny circle. Wiped off easy bit co tinued through the day no matter what brass.
I did check headspace with Plastigage when i installed the barrel and it was right at .052. Rifle fires great, never had any issue. Upon inspecting the spent brass, i noticed the bottom of many cases had a slight outward bulge, but no signs of cracking or anything like that.
Im probably missing the obvious here..... Thoughts ?

Was testing 7 different rounds.., it definitely shot best with CCI TNT. The A17, Hornady V Max, Federals, Super X. were fist size groups, the TNT was 5 touching at 100yd. Gamepoint and the 20g fmj were 2nd and 3rd as far as groups, ,075 max.
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Old 09-04-2017, 05:53 PM
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Remove the barrel and take a pic of the breech face and close up best you can of the chamber mouth. Then post it here .
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Old 09-04-2017, 06:07 PM
JWCF

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Tryin DJ, uploaded 3 pics but they arent showing. The bolt has a nice stripe of brass underneath as well. Pulled the barrel and it looks like it might be very lightly shaving rounds while chambering, although none of the spent rounds have any marks...
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Old 09-04-2017, 06:16 PM
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Heres the pics. There is a knife edge at tangent of the ejector slot and breech face. Spooky

Question is, what can i do about this.
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Last edited by JWCF; 09-04-2017 at 06:45 PM.
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Old 09-04-2017, 08:49 PM
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Deburr the mouth and polish, that should solve that issue. The rub marks on the bottom are the next round in the mag riding the bottom of the bolt. The rounds might be sitting to high.
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Old 09-04-2017, 09:09 PM
JWCF

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DJ, as always ypur sage advise will be followed :-) Ill lightly deburr amd polish and see where it goes, amd do a little more if needed. Thanks !
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Old 09-04-2017, 09:58 PM
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Is the bolt scraping the case or the bullet? If it's the latter, that could affect accuracy.
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Old 09-04-2017, 11:08 PM
JWCF

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Im going with case untill i can get more rounds down range to best assess its true accuracy. The CCI TNT and Gamepoint were great all day, so if there was a continued marring of the actual bullet, id expect to see falloff of those rounds as well. I didnt. Zero copper when cleaning, just some very fine brass powder on the first dry patch.
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