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Smoked Rifle Cartridge Necks
 Moderated by: Slingshot, Rockydog, klallen, DesertMarine, -6
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 Posted: Wed Oct 8th, 2008 03:54 AM
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mccoy426
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I fired my first 10 reloads for a .280 Rem in a Remington Model 700, using once fired Winchester nickel plated cases that were neck sized only, Federal 210 primers, 51.5 Gr. RE-19 powder (lightest load in "The Complete Reloading Manual for the .280 Remington"), and Sierra #1905, 7mm (.284"), 140 gr. SBT (spitzer boat tail) GameKing bullets, which were seated to produce the same overall length as factory loaded Win. 140 Gr. Ballistic Silvertip (SBST280) cartridges .  I was happy with the accuracy, the recoil was milder than said factory loadthere was no signs of excessive pressure, and no dirty chamber or bore, but the outside of the necks of the cases were slightly blackened.  What causes this, and is there any danger in it?

Thanks!



 Posted: Wed Oct 8th, 2008 11:39 AM
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Charley
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Low pressure loads often blacken case necks, due to lack of obturation. No particular danger, the signs are just telling you the pressure is so low that the case mouth isn't expanding quite enough to seal against the gas produced.



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 Posted: Wed Oct 8th, 2008 12:24 PM
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mccoy426
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Thanks a lot for the good information!  Now I can load more rounds like this without worrying about damaging my rifle, myself, or bystanders.



 Posted: Wed Oct 8th, 2008 02:41 PM
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wheezengeezer
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i agree with charlie.might want to bump it up a bit but no real reason other than purty cases when they come out and it might keep the chamber cleaner.just keep neck sizing them and they will last a long time.

Last edited on Wed Oct 8th, 2008 02:42 PM by wheezengeezer



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 Posted: Wed Oct 8th, 2008 03:42 PM
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Trigger_Puller
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using once fired Winchester nickel plated cases that were neck sized only
Unless they have been fired from YOUR gun, you should full-length size them first.  After they have been fired through your gun, then neck-size them only as the case will have pressure shaped it's self to match your gun's chamber.



 Posted: Wed Oct 8th, 2008 04:39 PM
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mccoy426
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Although it doesn't appear to be so, the chamber being a little dirtier doesn't bother me much, as I can clean it after a shooting session, but that does bring to mind another question. 

I have heard of hot loads eroding the throat of a gun; would escaping gas down the sides of the necks erode the chamber, even if it isn't a particularly hot load? 

By the way, these are cases I bought factory loaded.  They have only been fired in this one rifle of mine.  I never intend to fire them in any other rifle.  They chambered and extracted as well as when they were factory rounds.



 Posted: Wed Oct 8th, 2008 05:14 PM
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wheezengeezer
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Trigger_Puller wrote: using once fired Winchester nickel plated cases that were neck sized only
Unless they have been fired from YOUR gun, you should full-length size them first.  After they have been fired through your gun, then neck-size them only as the case will have pressure shaped it's self to match your gun's chamber.

even if fired in another rifle,the only reason to have tofull length size is to make them fit.i bought 200 nickel cases in 270 that were once fired.i tried every single case in the rifle and fl sized only those that wouldnt fit.  nickle cases especially should be worked a minimum.



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 Posted: Wed Oct 8th, 2008 08:03 PM
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Parsec
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"Obturation?"

I think I'll take that one to the range!



 Posted: Wed Oct 8th, 2008 08:29 PM
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Gutshot
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Let's ask the other guys on this one. I would suggest that you should try to anneal the cases and see if that would soften them enough as to allow them to seal better in the chamber. Just my thoughts though.



 Posted: Wed Oct 8th, 2008 08:40 PM
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saddlesore
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It's low pressure loads. At least go up to the middle range of the loading manual.

I would start mid range and load 5 rounds each at 1/2 gr incrments up to a little under max. You shoud see your groups getting smaller andthen get larger again.The smallest group undicates when youa  reclos eto the swet spot in that partiucalr barre. Then work around that load in 1/4 gr increments and adjusting your seating deoth until you get the optimum accuracy. I find that peak accuracy usually occurs about 2 grains under max in .06 taype cartridges and magnums usually like to run right at max

Loading to the same COL as the factory loads does not neccesarily get you the same distance off the lands as different mfg have differnt shaped ogives on thier bullets.

As for throat erosion. Rapid fire is the worst culprit here. An average hunting rifle will go a long ways before there is noticable differnce in the throat unless one is running very hot loads



 Posted: Wed Oct 8th, 2008 09:20 PM
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Charley
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Parsec wrote: "Obturation?"

I think I'll take that one to the range!

Well, I was going to say, "the end of the brass thingy doesn't get all swelly uppy when the head comes out", but thought that might sound a little weird...



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 Posted: Sun Oct 12th, 2008 12:13 AM
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Projektyle
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mccoy426 wrote: ...  What causes this, and is there any danger in it?

Thanks!


No danger, it's normal. :thumbs:

 

A neck always get that black smoke on it during the expanding process of firing.

If you had low pressure, the black smoke would get on the collet and the case body too.



 Posted: Tue Feb 3rd, 2009 04:56 AM
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bigcountry
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also believe that most case necks do smoke slightly,was always told that was normal ,you just do not want to be smoking the shoulders then you have pressure problems.



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