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How would you rate this chamber job?

 
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  #57  
Old 07-31-2011, 10:51 AM
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Join Date: Jul 2004
Location: Texas
Posts: 5,384
Re: How would you rate this chamber job?

Quote:
Originally Posted by Jinx-) View Post
By the way, I talked to my smith and he recommend me wood dowel with fine grit sandpaper to finish shoulders in that chamber, so I I made wood dowel shaped like my chamber with 30 degree shoulders, and I used 320 grit sandpaper and I think he was right its getting better! He is an old-timer and retired, but I guess he build rifles for 40 years and knows something... Still far from perfection but that's how brass looks now:



maybe few more passes and I'll get rid of them rings...

Jinx.

Just a word of warning !!!! Be careful when polishing a chamber because it leads to out of round
and out of SAMMI specs.chambers that can cause extraction and concentricity problems.

I personally "NEVER" polish chambers. the reason is that I like the reamer finish if done correctly
because it eases the thrust on the bolt by having the proper finish allowing the case to grip the
chamber but still allows extraction with heavy loads.

With a good/sharp reamer the chamber will be the truest it can be if it is done right. and even
though your chamber looked terrible and you want to improve the finish be careful.

Polishing a chamber is not necessary but some smiths like to do it for there own reason and are
very careful so it is ok as long as it is not to cover up a poor chamber.

I would not polish yours any more than you already have.

Just MY opinion.

J E CUSTOM
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  #58  
Old 07-31-2011, 11:41 AM
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Re: How would you rate this chamber job?

J E, thanx! I'm getting new barrel to replace this one and since the one I got is no better then tomato stake, I'm just going to play with it and try to improve it. But since it has dense spots (hard spots) overall vibrations throughout must be different and I think they relate to fliers, because I don't have any other explanations, since I do not see any pattern.
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  #59  
Old 07-31-2011, 03:24 PM
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Location: Texas
Posts: 5,384
Re: How would you rate this chamber job?

Quote:
Originally Posted by Jinx-) View Post
J E, thanx! I'm getting new barrel to replace this one and since the one I got is no better then tomato stake, I'm just going to play with it and try to improve it. But since it has dense spots (hard spots) overall vibrations throughout must be different and I think they relate to fliers, because I don't have any other explanations, since I do not see any pattern.
You are very welcome.

I just didn't want you to create any more problems for yourself.

Good luck.

J E CUSTOM
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  #60  
Old 08-02-2011, 11:44 AM
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Join Date: Sep 2003
Posts: 61
Re: How would you rate this chamber job?

Ugh!

I wouldn't let a rifle out of the shop with a chamber like that.

The ring on the neck is a real issue in my book. The rings on the shoulder just shows extremely poor workmanship and no attention to the details.
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  #61  
Old 08-03-2011, 12:05 AM
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Re: How would you rate this chamber job?

Well, it was hard learned lesson for me...
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  #62  
Old 08-03-2011, 03:44 PM
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Posts: 693
Re: How would you rate this chamber job?

this is not a ring, I did little experiment with it, on new brass I turned necks then fired few shots then I turned necks again, here what neck print looks like:



not good at all... Yeah, my Forster neck turner also non concentric just another problem to deal with... Why in the world it cuts right on the neck from one side and on shoulder on the other, however it could be my chamber heck shoulder junction which is non concentric...

Last edited by Jinx-); 08-03-2011 at 03:56 PM.
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  #63  
Old 08-04-2011, 08:47 AM
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Join Date: Jul 2010
Posts: 420
Re: How would you rate this chamber job?

The fire formed brass is telling the truth about the chamber shape and dimensions. It could have happened during your polishing treatment but I dont think so. It is suspicously starting to look like the O.P. used a hand drill motor to rechamber your rifle. The chamber is definately running at an angle to the bore. This also happens fairly often on new factory barrels, as well as off centering. I dont know which came first the chicken or the egg? At this point I would have to say you've exhausted remedy! Throw that barrel in a recycling bin as well as all the brass that was formed in it. I am seriously concerned that the over all uneveness of the cartridges ability to seal off the gases as evident by the powder residue indicates that catastrophic failure is in that barrels near future. I don't know how many people have had the experience of escaping gases being shot into their faces, but I have and I feel I was very lucky to have only ruined a cheap pair of safety glasses.
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