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.338 Norma Magnum

 
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  #1  
Old 12-27-2011, 04:58 PM
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Location: Butler, Pa
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.338 Norma Magnum

Just curious why everyone is so paranoid about building the .338 Norma magnum on a 700 long action. They already make after market bolts with the Lapua bolt face for it. The designer of the Norma designed this cartridge for a 700 platform and to fit in a normal size mag box. I really dont see the issue open up a bolt face laterally to .585 the lugs are still lugs your not loosing any metal on the lugs at all due to the nose on the Remington bolt. I keep reading about pressures of the case being brought up a lot but Remington chambers the 700 long action to fire the .300 Ultra mag as it is with an operation pressure of 65,000 PSI and the max pressure of the 338 Norma is around 62,000 PSI so it is under what a standard caliber already chambered and fit for that action. So I don't know why its recommended against building on this type of action. I am planning on starting mine come January and was wondering just what I am missing or are people that afraid to try something.
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  #2  
Old 12-27-2011, 07:03 PM
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Re: .338 Norma Magnum

I have not heard of any issues with the 338 Norma, particulariy if you change the bolts.


Have seen more than several built on 700 clones and 2 on the 700. Personally think it is better to just sell the 700 and buy a quality clone, but each to his own.
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  #3  
Old 12-27-2011, 08:27 PM
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Re: .338 Norma Magnum

The issue is that you are increasing the surface area of the bolt face. You've already noted that they run about the same amount of pressure. Same pressure with more surface area puts more load on the lugs and abutments.

I'm not saying that is is dangerous or safe, just that it is more stress in the action than what the RUM do.
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  #4  
Old 12-28-2011, 06:16 AM
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Re: .338 Norma Magnum

So is the PTG replacement bolt lugs bigger than factory on their long action replacement bolt with 416 bolt face. Cause if not wouldn't it be just the same as opening up the factory bolt?
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  #5  
Old 12-28-2011, 06:52 AM
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Re: .338 Norma Magnum

Another consideration may be the bottom lug abutment,the feed ramp needs to be opened up to feed this diameter case which will reduce strength in that area.
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  #6  
Old 12-28-2011, 11:29 AM
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Re: .338 Norma Magnum

Quote:
Originally Posted by Xringcustomgunsmithing View Post
So is the PTG replacement bolt lugs bigger than factory on their long action replacement bolt with 416 bolt face. Cause if not wouldn't it be just the same as opening up the factory bolt?
A 416 Rigby replacement bolt from PTG has the same dimensions, other than the bolt face, as a Rem 700. Same as opening up a factory bolt. No gain in strength.

Most of the custom actions that are made for the 338 go to a larger bolt body (0.750") and a slightly larger diameter action to allow for larger lugs on the bolt and larger abutments in the action.
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  #7  
Old 12-29-2011, 11:56 PM
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Re: .338 Norma Magnum

Quote:
Originally Posted by Xringcustomgunsmithing View Post
So is the PTG replacement bolt lugs bigger than factory on their long action replacement bolt with 416 bolt face. Cause if not wouldn't it be just the same as opening up the factory bolt?
depends on more than that. Steels are different, you can about bet that remington is
not going to any great costs to use the best. Typical steels are in the 40,000 to 80,000
psi yield strengths, for more money you can easily jump to 300,000 and more.
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