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Concentricity Issue?

 
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  #8  
Old 12-26-2013, 01:00 AM
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Re: Concentricity Issue?

If reloads, did you check all sized cases for smooth fit?
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  #9  
Old 12-26-2013, 10:23 PM
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Join Date: Jul 2013
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Re: Concentricity Issue?

The weird part was that it happened about 1/2 the time. enough to where I was checking to see if each round would actually feed into the chamber without forcing it. I fired 37 rounds of factory 120 grain NBT's through the gun as to break it in, and there was no faults or abnormal pressures during loading/unloading from the mag or singles. This makes me think that maybe the chamber doesn't like the VLD style bullets? or were they seated so wrong that they were coming in at a stupid angle? I was shocked to see this happening, and it made me upset. I would like to be able to load up these bullets without relying on factory ammo. (obviously). and to make this known, I am not a beginner in reloading, but the first time for this rifle. I will try to see if the wear is happening on the same side every time, or if it is cause by a weird entry into the chamber. Please keep the ideas coming, Im sure one of them will be right. BTW, the rifle is a factory Savage 11/111 LRH. It shot .5 MOA with Factory Nosler NBT's in the 120 grain variety.
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  #10  
Old 12-26-2013, 11:04 PM
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Re: Concentricity Issue?

Are you measuring the seating depth off the tip of the bullet or using a comparator and measuring off the ogive.

Jeff
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  #11  
Old 12-27-2013, 04:58 AM
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Join Date: Feb 2008
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Re: Concentricity Issue?

Please excuse my ignorance, does this rifle have a plunger type ejector?
If so, when a bullet is seated so that it is very close to the lands, and the cases are unfired or FL sized, the cartridge can be pushed to the opposite side of the plunger and the end result is contact on one side with the rifling, although it may look like a crooked chamber or throat it most likely isn't in the presence of a plunger type ejector. If the rifle doesn't have a plunger ejector, then I would have a chamber cast made to assess what the cause is.
Do your fired cases show any signs of chips or the like in the chamber?
Is it possible that a partial ring of bullet jacket material is stuck in the throat and forcing the cartridges to one side?
Have you cleaned the rifle since finding this problem?

Hope this helps you out.

Cheers.
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  #12  
Old 12-27-2013, 06:32 AM
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Re: Concentricity Issue?

You said you didn't have an issue with the break in. Was that with virgin brass? But have issues with the once fired brass? Do you have a concentricity gauge? I would be checking fired but unsized brass and sized once fired brass first. Then I would be checking runout of the bullet.

If you can get to a borescope inspect the throat to see if it was cut properly. Since I have acquired my borescope I have discovered some rifles with crooked throats. I could see that the lands are longer on one side and shorter on the opposite side of chamber.

Is this a custom rifle? Was the action trued? There is a possibility that the bolt face is not 90 degrees to the chamber centerline. I encountered this once with a custom rifle. It shot virgin brass perfectly but once fired brass shot horribly. Once the bolt face was squared properly and headspace readjusted it shot fine.

This is going to require some effort on your part to solve the issue. When you do please be sure to post your findings here.
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  #13  
Old 12-27-2013, 08:39 AM
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Join Date: Nov 2012
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Re: Concentricity Issue?

Can you compare the factory ammo to what you are reloading? I found that I was not pushing back the shoulder on some 300 WM ammo, which caused the bolt to close hard. Once I compared the factory to what I was doing, the shoulder needed to be .015" - .010" shorter. Try to eliminate one thing at a time. When I get frustrated with a project, some times I can not see the trees because on the forest. I will leave the project for a day then try to look at it from a different direction.
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