close
Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels & Ballistics

Rifles, Bullets, Barrels & Ballistics Applied Ballistics

Reply

300 Norma Mag

LinkBack Thread Tools Display Modes
  #36  
Unread 10-05-2013, 05:55 PM
Platinum Member
 
Join Date: May 2008
Location: South of Canada and North of Wyoming
Posts: 6,068
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.
__________________
- Mark

You will never know how much it has cost my generation to preserve your freedom. I hope you make good use of it.
~ John Quincy Adams
Reply With Quote
  •   #37  
    Unread 10-05-2013, 06:00 PM
    Platinum Member
     
    Join Date: Oct 2008
    Location: Boise, ID
    Posts: 1,423
    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.
    Reply With Quote

      #38  
    Unread 10-05-2013, 07:28 PM
    Silver Member
     
    Join Date: Feb 2010
    Location: Smalltown, Virginia
    Posts: 477
    Re: 300 Norma Mag

    Quote:
    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
    __________________
    "...I shoot big cartridges, not because I am ego bound, not because they are needed to kill big game when well placed shots are made, but when an error is made, they will get you out of trouble more often then a lesser round."

    --Kirby Allen
    Reply With Quote
      #39  
    Unread 10-05-2013, 08:15 PM
    Platinum Member
     
    Join Date: May 2008
    Location: South of Canada and North of Wyoming
    Posts: 6,068
    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.
    __________________
    - Mark

    You will never know how much it has cost my generation to preserve your freedom. I hope you make good use of it.
    ~ John Quincy Adams
    Reply With Quote
      #40  
    Unread 10-06-2013, 06:04 AM
    Silver Member
     
    Join Date: Feb 2010
    Location: Smalltown, Virginia
    Posts: 477
    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.
    __________________
    "...I shoot big cartridges, not because I am ego bound, not because they are needed to kill big game when well placed shots are made, but when an error is made, they will get you out of trouble more often then a lesser round."

    --Kirby Allen
    Reply With Quote
      #41  
    Unread 12-11-2016, 09:52 AM
    Official LRH Sponsor
     
    Join Date: Mar 2007
    Location: Montana
    Posts: 2,667
    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
    __________________
    Hammer Bullets
    Advanced Technology
    Simply Better


    To hunt... or not to hunt...? What a stupid question.
    Reply With Quote
      #42  
    Unread 12-11-2016, 06:23 PM
    Junior Member
     
    Join Date: Apr 2010
    Location: south of Minneapolis
    Posts: 12
    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
    Reply With Quote
    Reply

    Bookmarks

    Thread Tools
    Display Modes


    Similar Threads for: 300 Norma Mag
    Thread Thread Starter Forum Replies Last Post
    6.5-284 Norma RyanG Rifles, Bullets, Barrels & Ballistics 12 03-03-2011 08:36 PM
    308 Norma to 338 Norma Mr Phill Gunsmithing 3 11-18-2010 04:22 PM
    308 Norma Mag Slopeshunter Reloading 2 08-07-2009 08:49 AM
    308 norma mag George LS Reloading Equipment and Components 0 01-23-2009 10:55 AM
    .358 Norma Mag HuntnID The Basics, Starting Out 6 12-11-2008 12:23 PM


    All times are GMT -5. The time now is 05:21 AM.


    Powered by vBulletin ©2000 - 2017, Jelsoft Enterprises Ltd.
    Content Management Powered by vBadvanced CMPS
    All content ©2010-2015 Long Range Hunting, LLC