300 Norma Mag std VS Improved - 3200fps A-max?

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by 300magman, Apr 5, 2011.

  1. 300magman

    300magman Well-Known Member

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    Does anyone have any experience with the new 300 Norma Mag, I'm wondering if it will get a 208gr A-Max up to 3100 to 3200 fps out of a 26-28" barrel.

    And I'm wondering how it compares to one of the improved versions like the 300Jazz, 300 Hulk, or 30 Nawakwa . . . In terms of case capacity, velocity increase, and ease of feeding.

    This is to be primarily a hunting rig, so feeding and reliability is important, and I'm wonding if the steep shoulder angle and minimal body taper on the "improved" versions of this cartridge will give me any trouble.



    I could also use imput on barrel length, I read somewhere that the standard 300 norma mag worked very well in only a 26" barrel . . . is that generally correct? or would I see a significant jump in velocity (or reduced muzzle blast) with a longer barrel?
    And of course, same barrel length question regarding the improved versions.
     
  2. trueblue

    trueblue Well-Known Member

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    Send me a PM with your #, and I will tell you all about the 300 JAZZ.
     

  3. 260shooter

    260shooter Well-Known Member

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    I am about a month out from my 300 NORMA being finished. Using a 28" bbl. I spoke with MR. Sloan some time ago and was advised to expect around 3175 fps with the 208.

    When it is up and going I'll post updates.

    260
     
  4. Camshaft

    Camshaft Well-Known Member

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    So what is the advantage of this cartridge? It's performance seems identical to the 300rum. Is the case more efficient? Short action? Better brass? just curious.....
     
  5. 300magman

    300magman Well-Known Member

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    I was hoping it might slightly surpass the RUM, as I haven't heard too many reports of the RUM making 3100-3200 fps with the 208, A-max ... which is my goal (for the moment)
    I'm also not sure how the powder capacity compares to the RUM, but I imagine it is very similar, only in a shorter case that allows the bullet to be seated in a standard magazine while not pressed so far back in the case. (Still a long action though)
    As for brass, I don't know how good the RUM brass is, I've never looked into it much...but I hear the 300 Norma is top quality stuff.
     
  6. Camshaft

    Camshaft Well-Known Member

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    Ok, thats kind of what i was figuring. I really like the idea of this cartridge. I am currently using the 210 Sierra Matchkings in my 300rum at 3170fps with a 26" bbl. They are very similar to the Berger VLDs but seem to group better for me. I have a early M700LSS 300rum (2000) and it has a ton of freebore which makes it almost a perfect throat for the 210's. But it doesnt so well at fitting in the magazine. This doesnt bother me for hunting purposes as here in california we can only hunt with lead free ammo, and the 165gr GMX bullets shoot lights out. But it would still be nice the get my target rounds in the mag, and use the far superior Norma brass. I will be seriously considering this cartridge for my upcoming build.
     
  7. Nieko

    Nieko Well-Known Member

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    I am also considering a 300 Norma of some sort. I have heard the standard 300 Norma is deadly accurate but is the Jazz faster with the 30 degree shoulder? It sounds like true blue had great accuracy with his Jazz but is it going to be worth getting custom dies ect?
     
  8. bassin93

    bassin93 Well-Known Member

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    300magman, my sendero II had no problem making 3150 with the 208 amax or the 210 berger with a 26" barrel. and the loads were not hot. I used 96grns of retumbo.
     
  9. JeffVN

    JeffVN Well-Known Member

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    300 RUM is based on a magnum boltface, while the 300 Norma Magnum is built on a 338 LM boltface, using 338 Norma Magnum brass that has been necked down to 30 cal - they now have 300 Norma Mag headstamp brass. As a result one uses a 338 LM action the other a standard magnum action (I know folks build 338 LM on a magnum action, but I'm not one of them). My memory may be failing me, but my research reflected teh 300 norma mag case capacity right at 105-108 grains of water and the 300 RUM something around 112-115 grains of water.

    The 300 Norma was designed to accomodate the 300 grain sierra 338 without much impingment on the case capacity and still fit into a standard 338LM magazine. If oyu put a 300 grain 338 pill into the RUM equivelent brass and then seat them into a LM magazine, you eat up a bunch of case capacity with the bullet.

    Jeffvn

    Yes Jimmy loves the 300 Norma, much better than the 338 version.
     
  10. ptsdvet

    ptsdvet Member

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    I have had a 300 win for over 40 years a great gun but you have to bury a 200 gr lead in the charge The 300 ultra is like over charge for what it gains. All the short fat mags are just hot rod 06s This 300 norma sounds like an answer to 3000fps in a hever bullet.
     
  11. TH

    TH Well-Known Member

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    I have a 338 norma necked down to 30 cal and improved. I shoot the 208 A max at 3275
     
  12. ptsdvet

    ptsdvet Member

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    I Have at least two mauser actions sitting around and I just rebuilt my 300 win so am very familair with cost but what are brase cost, where did you get dies and is this two or three peice set of dies and have you bought any of the headstamped 300 norma brass? mike
     
  13. 260shooter

    260shooter Well-Known Member

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    I am getting 3100 fps with 208's in my 300 Norma with a 28" bbl. Found an accuracy node at 3100 with single digit extreme spreads. and going higher the E/S went up considerably.