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How to build a 338 Norma

 
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  #8  
Old 12-06-2009, 04:07 PM
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Re: How to build a 338 Norma

So I am asuming that the 338 edge does not have the same bolt thrust as the 338 Norma mag . What is bolt thrust? Is that recoil on the bolt?
Darrin
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  #9  
Old 12-06-2009, 04:35 PM
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Re: How to build a 338 Norma

I went through a bunch of threads and could not find the math, there are a lot of guys doing these large 338's on Rem 700 of Savage target action but you will find a large amount of guys that won't touch it. Most of what starts as a guy wanting to do the 338 LM or NM ends in them going with a 338 EDGE or RUM.
The Savage 110 coming out in a 338LM has me all worked up also but more to take the LM barrel of and screw on a NM barrel to gain bullet seating space for a repeater with longer Berger bullets that will some day magically drop from the sky. But a lot of guys say there is not enough gain over the RUM.
I believe bolt thrust is like a hydraulic cylinder, you can run the same pressure but increasing the surface area gives you more thrust or lifting capability.
Hopefully someone will do the math for you before I over think something again
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  #10  
Old 12-06-2009, 08:43 PM
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Re: How to build a 338 Norma

Is it worth the trouble? I can have an edge built for $500. But I liked the fact that I could buy factory Norma brass for the 338 Norma. And if I had an edge built I would have to open up the 300 rum brass myself. Just a thought
Darrin
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  #11  
Old 12-06-2009, 09:00 PM
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Re: How to build a 338 Norma

Opening up the 300 rum brass shouldn't be a problem, except it won't be headstamped 338 edge.
If you don't want to do that read this thread, Barrell Life 338 rum vs 300 rum

Towards the end it discusses the difference between the 338 RUM and 338 edge.

Hope this helps,

Stu.
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  #12  
Old 12-06-2009, 10:34 PM
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Re: How to build a 338 Norma

Quote:
Originally Posted by darrindlh View Post
Is it worth the trouble? I can have an edge built for $500. But I liked the fact that I could buy factory Norma brass for the 338 Norma. And if I had an edge built I would have to open up the 300 rum brass myself. Just a thought
Darrin
If the new Norma 338 is down on velocity of the Lapua then the easy way to go would be the
338 rum. (Not a wild cat, ballisticly a little faster than the Lapua loaded to the same pressure,
has a standard magnum case head that would fit the bolt face of any magnum (.534 dia.).

This also means that you can use a standard Remington,Winchester or other action and
save money for other purchases.

And to explain the thrust issue+ If a bolt face has 1 square inch of surface and the load
produces 60,000 lbs/sq in then the bolt sees 60,000 pounds of force. If the same pressure
is applied to a bolt face that has 1.500 square inches then the bolt sees 90,000 lbs of force.

This load Is transferred to the bolt locking lugs and with a safety factor of 2 to 1 this reduces
the factor by 50 %. so keeping the bolt face as small as possible is important.

The Rum will hold 4 to5 more grains of powder than the Lapua and the Edge will hold 3 to 5
more than the 338 RUM.

So the choice is yours. The cheapest to build between the 338 Lapua, 338 Norma, 338 RUM
and the 338 Edge would be the 338 RUM, (Not a wildcat,factory ammo, no modifications to
the action and correct head stamp of brass). the most expensive but one of my favorites
would be the 30/338 lapua Improved. great brass, larger action and bolt face ,expensive
brass. Custom dies,custom reamers,fire formed brass .

My Elk rifle is a 338 rum and it is good for 1500 ft/lbs beyond 1100 yards the limit of my
ability at 68 years of age on big game. (Except hogs have no limits).

J E CUSTOM
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  #13  
Old 12-06-2009, 10:38 PM
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Re: How to build a 338 Norma

Not having a headstamp on the caseing would not be a problem. I just want a rifle that I can push to 2k on steel targets. I am a long way away from that but with practice it will be doable .
Darrin
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  #14  
Old 12-06-2009, 10:53 PM
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Re: How to build a 338 Norma

Quote:
Originally Posted by darrindlh View Post
Not having a headstamp on the caseing would not be a problem. I just want a rifle that I can push to 2k on steel targets. I am a long way away from that but with practice it will be doable .
Darrin
Darrin. any of the big 30s will do that and the 338 will be better for wind bucking.

For paper or steel a 308 is capable of shooting 2,000yard Creedmoor matches in the hands of
a good shooter but error becomes magnified so the use of a big magnum really helps. the
British used the old 303 for the creedmoor matches for years and did well. the first one I shot
I was using a 7 Rem Mag and placed first in my class.

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