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Model 70 Extraction Problems

 
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  #8  
Old 11-13-2012, 10:38 AM
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Re: Model 70 Extraction Problems

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Originally Posted by Buano View Post
I have checked the extracted cases. The only "marks" are extremely light and right above the base of the cartridge. These marks look like the case was expanded against the sides of the chamber & pulled out HARD, but there are no deep marks, gouges or indentations only rub marks. It doesn't seem like there is a rough chamber, it acts like I'm WAY over-pressure with factory ammunition. Being WAY over-pressure with factory ammunition is what concerns me.


My thought at this stage is to polish the chamber with rubbing compound, a swab, and a drill on low speed. If that doesn't work it looks like time for professional help.
I dont know if I would do that, I would ask a gunsmith
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  #9  
Old 11-13-2012, 11:51 AM
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Re: Model 70 Extraction Problems

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Originally Posted by ICANHITHIMMAN View Post
I dont know if I would do that, I would ask a gunsmith


Thanks. I was looking for others' thoughts before I did anything.
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  #10  
Old 11-18-2012, 03:00 AM
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Re: Model 70 Extraction Problems

Is the bolt hard to lift after firing can you see a shiny spot on the case head. Where the ejector slot is? Are there any shiny rings on the case body
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  #11  
Old 11-18-2012, 09:39 AM
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Re: Model 70 Extraction Problems

Yes, the bolt is hard to lift. The only marks on the case is right a above the base where there is a clear 1/4 inch that shows "rub" marks where it pulled out of the chamber HARD.

I contacted Winchester & they suggested I send the rifle to them for evaluation. That looks like my next step.

I wasn't at all pleased with what the Winchester rep told me over the phone — that this virtually always means there is rust or debris in the chamber. It's a stainless rifle that was likely unfired and we checked the chamber and found it to be smooth, clean, and shiny.

Last edited by Buano; 11-18-2012 at 10:30 AM.
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  #12  
Old 11-18-2012, 12:40 PM
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Re: Model 70 Extraction Problems

Where the bolt is hard to lift I would say it is high pressure this could be caused by a chamber or throat out of spec. It could also be caused by interior barrel Finnish or if it has been shot more than you think it could have a section of copper build up that you might not be able to see without a bore scope. The least expensive way to get it fixed will be to send it to Winchester. Have you tried a differant lot of ammo? It could be soft brass. We saw a lot of it when the WSM was first introduced.
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  #13  
Old 11-18-2012, 07:01 PM
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Re: Model 70 Extraction Problems

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Originally Posted by BPreheim View Post
Where the bolt is hard to lift I would say it is high pressure this could be caused by a chamber or throat out of spec. It could also be caused by interior barrel Finnish or if it has been shot more than you think it could have a section of copper build up that you might not be able to see without a bore scope. The least expensive way to get it fixed will be to send it to Winchester. Have you tried a differant lot of ammo? It could be soft brass. We saw a lot of it when the WSM was first introduced.



Weatherby brass is as consistent as anything ever produced so it's unlikely I'm dealing with soft cases.

I agree there is little chance it's anything but an over-pressure situation. The question is, "Why?".

My thoughts leaned towards a throat out of spec but for some STUPID reason I never suspected a copper buildup. Obviously this used rifle might have been shot a fair amount & cleaned up to where it looked to be unfired. A copper buildup in the barrel is something I should have checked. Thank you for reminding me to check the obvious!
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  #14  
Old 12-23-2012, 10:18 PM
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Re: Model 70 Extraction Problems

I know the problem, now I need the solution:

The rifle has a VERY ROUGH barrel that loads up with copper FAST!!

After chemically stripping all copper from the barrel and Running some JB Bore Brite through it, it worked well for 3 shots with no signs of pressure. By shot #4 the bolt started to stick & by shot 6 I had to stop because I didn't think I would be able to extract shell #7 without tools. I was then WAY over pressure with factory loads.

What say you, oh great men of experience? Do I lap it, have it electro-polished, or...?????
What's my best option?

Eventually I do want to replace the barrel to add a few inches but I didn't plan on doing that any time soon.

Suggestions????
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