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300 Norma Mag

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  #36  
Unread 10-05-2013, 05:55 PM
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Re: 300 Norma Mag

Without trying to badger you, the bottom line IMO is that a 300 Norma Mag is not going to get anywhere close to 2500 rounds of accuracy... accuracy meaning if you start shooting 1/2 MOA with it, it's probably going to open up to greater than .7 MOA long before 2000 rounds if you're shooting 65,000 psi

The only way a case design will increase barrel life is to lengthen the neck and sharpen the shoulders. But even that benefit is limited. When you torch your throat and bore with heat and pressure, it is going to have an affect on the steel. The 300 Norma Mag has a moderately long neck but only a 20* shoulder. There is really little to nothing about the case design that is conducive to long accuracy life.

I'm sure it's a fine cartridge, although I think it would be better with a 30* or sharper shoulder.
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  #37  
Unread 10-05-2013, 06:00 PM
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Re: 300 Norma Mag

Quote:
Originally Posted by MontanaRifleman View Post

I'm sure it's a fine cartridge, although I think it would be better with a 30* or sharper shoulder.
Or 35* . I'll have one before too long.
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  #38  
Unread 10-05-2013, 07:28 PM
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Re: 300 Norma Mag

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Originally Posted by MontanaRifleman View Post
Without trying to badger you, the bottom line IMO is that a 300 Norma Mag is not going to get anywhere close to 2500 rounds of accuracy... accuracy.
Badgering..no sir..im agreeing with u. I can only tell u what the designer told me. I have enough (maybe not as much as some) to know what affects barrel life and i see very little difference in the norma and the rum in terms of barrel eating ability! Just decided to post what i received from jimmy. Ive never even shot a norma so i couldnt speculate
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  #39  
Unread 10-05-2013, 08:15 PM
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Re: 300 Norma Mag

Quote:
Originally Posted by ishootkittens View Post
Badgering..no sir..im agreeing with u. I can only tell u what the designer told me. I have enough (maybe not as much as some) to know what affects barrel life and i see very little difference in the norma and the rum in terms of barrel eating ability! Just decided to post what i received from jimmy. Ive never even shot a norma so i couldnt speculate
I just read the writeup for the 338 Noram Mag in Ammoguide. It says it's supposed to have better barrel life than the 338 Lapua. Maybe just a tad since it's a tad smaller in capacity. Other than the Norma being shorter and fatter at the shoulder, it is very much like the Lapua. I would like to know his reasoning. Sometimes creators go a little overboard in their promoting.
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  #40  
Unread 10-06-2013, 06:04 AM
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Re: 300 Norma Mag

I agree. We all saw how long the .300 lapua lasted. There aare a few here and there but they eat through barrels like it's jello! Id say the .300nm will get u a LITTLE more barrel life.
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  #41  
Unread 12-11-2016, 09:52 AM
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Re: 300 Norma Mag

Old thread, but a good one. I wanted to add to this one as it pertains to what we are working on.

We just got a customer rifle done and started doing load development. It is a 300 Norma mag improved. Rifle is Defiance Deviant action, Proof carbon fiber Sendero contour at 26", medium Pain Killer brake, Jewel trigger, AG Composite sporter stock, topped with Nightforce SHV 5-20X56. The improvement picked up about 6.5g in powder capacity. We got about 1/2 of the brass fire formed and just couldn't wait to work loads, so we stopped forming and went to loading. The Proof barrel is a 9.4" twist so we designed a 200g Hammer Hunter for it. We also HBN coated them.

Started load work up with RL-26 but stopped after a few rounds as it was looking like we would not be able to get enough load density with it. We then tried RL-33 and ran out of case capacity and barrel length to get to pressure. Next on the list was H1000. This turned out to be the ticket. We reached about 98% load density, just under compressing, at 90g and 3250fps. At this point the load was just starting to show some pressure with slightly flattened primer. If it were our rifle and it was staying here we probably would have taken it higher to see top end, but there was no point as this rifle will be living in Missouri. We backed down a grain to 89g for a vel of 3215fps and single digit sd's. Very happy with this cartridge and load. Shooting RUM velocities with 10g less powder and a significantly shorter cartridge. Fits nicely in standard magazine with bullets seated out long enough to stay out of the powder column.

Rifle looks like a very good shooter. So far only shot at the short 200 yard range. All of the load development fell inside 3" and the final load was shooting inside 1". This rifle is at 10.5lb and very comfortable recoil wise. About like .243.

300 Norma Mag-300-norma-fire-form.jpeg
This is a pic of fire forming before and after.

Steve
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  #42  
Unread 12-11-2016, 06:23 PM
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Re: 300 Norma Mag

Thanks, I've got a surgeon rifle in this caliber and just st getting started. I'll let you know how it works

Merry Christmas!

Mark
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