300 Norma Improved

Discussion in 'Big Stuff -- 6.5mm, 7mm, 30 Cal' started by rpierce, Sep 10, 2018.

  1. bigngreen

    bigngreen

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    I've seen two RUMs that set back the lugs, one in a Defiance and one in a Rem. they have less bolt thrust and untill recently with ADG the brass quality wasn't up to holding the pressures of the Lapua so you'd run lower pressure than a Lapua would show.
    Kirby Allen has probably done some of the more agressive wildcatting with the Lapua and he does unitial pressure work with Norma brass so the pressures show then once he has his pressures figured out switches to Lapua brass which definitely would keep things under the red line.
     
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  2. slugger3

    slugger3

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    Ok, so are ALL actions suseptible to bolt set back, (custom and factory) especially if they are subjected to loads like the 300 RUM shooting 90 to 100 grains of powder?
     
  3. jb1023

    jb1023

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    Fascinating topic, and timely for me as I will soon be shopping for a action for a 300/338 NMI.
     
  4. aahall517

    aahall517

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    How does the norma improved compare overall to the 30 nosler. Ive heard some great things about it as well?
     
  5. L.Sherm

    L.Sherm Silver $$ Contributor

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    The 30 Nosler would stack up better if the Nosler primer pockets didnt suck.
     
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  6. IdahoCTD

    IdahoCTD Silver $$ Contributor

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    Depending on the brass used and the exact improvement on the Norma Imp your looking at 108-110grs of water capacity. A 30 Nosler is about 99grs. A 30 Nosler is basically a 300 Weatherby in a shorter fatter package.
     
  7. Borisserge

    Borisserge

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    As an alternative possible action as a hunter is a sako trg-s m995. Pretty much a "sporterised" sako try, which run factory 338LM
     
  8. slugger3

    slugger3

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    Anyone built a 300 NM on a Savage Lapua action?
    Results?
     
  9. Ledd Slinger

    Ledd Slinger Gold $$ Contributor

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    Savage is not worthy of the 300 NM :p
     
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  10. rpierce

    rpierce

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    Thought I would throw some updates on this thread. I started tinkering with VV N570 powder. I did a ladder/pressure test. I got up to 3314 fps with a 215 berger. Honestly the pressure signs weren't really there. The case web expanded just a little bit from 1.5 gr less powder. I just thought I would hit 3300 with a lesser charge and didn't have anymore loaded up with more powder. Im guessing it was gonna start showing solid signs pretty quick though. There was a big node on the target and chrono at 3245 fps. I loaded some up and the 3 shot group had an ES of 3 and measured 1.05" @400. Ive since also tried some different primers as well and CCI 250's offered great ES also at that node. I had a 3 shot group that measured .687"/.164moa at 400 with them and it had an ES of 2. It has since shot a .8" group at 400 with small ES. This 3245 fps node isn't hot. The web doesn't expand at all and the primer pockets are super tight. I think this node will let brass last a very long time. This heavy rifle I have is more or less my testing rifle so I have as much different load info to give customers as possible. I will be getting some IMR 8133 in a few days and plan on testing it out. Preliminary results from people is that it offers great velocities with zero temp sensitivity. So if a guy cant find VV N570 it might be a great alternative. But we will see.
    570 load.jpg
     
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  11. Ledd Slinger

    Ledd Slinger Gold $$ Contributor

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    I've been working a little bit with IMR 8133 alongside RL33 with 230gr Sierra MKs and Bergers in my 300 Norma Improved (35 deg shoulder, .235" freebore, and 0.018" body taper from shoulder datum to.200" line).

    The burn rate of 8133 is right around Retumbo (my rifle hates Retumbo btw). Its slightly slower than H1000, but definitely faster than RL 33. I havent had the chance to run 8133 up to max speeds yet, but so far I am getting 3050 fps with the 230gr in a 31" barrel, 1 in 8" twist, and 89gr charge weight. Still have throttle left and its shooting pretty decent. Will need to stretch out the distance and tune it in with 5 shot groups once I find a safe max speed. I will say that 8133 does burn very clean and it is fairly dense so you can fit plenty in the case. Not as dense as RL33, but I'm not sure that any other powder is as dense as 33.

    RL33 has a lot of throttle and case capacity left and is showing more promise on accuracy so far, but it's still a toss up between the two powders because I'm still increasing charge weights.

    Target at 100 yards with 230gr Sierra MK (new .800 G1 BC). Squares on target are 1"x1".

    20190114_223318.jpg


    Target at 100 yards with 230gr Berger.

    20190114_223249.jpg
     
    Last edited: Jan 17, 2019
  12. rpierce

    rpierce

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    Thank you for the info. Im looking forward to hearing updates on it from you. Hopefully Ill be testing it late next week.
     
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  13. IdahoCTD

    IdahoCTD Silver $$ Contributor

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    Ledd Slinger,

    Yours is basically the same as mine with 35 degree shoulder and .235" throat. It looks to shoot most everything into small groups like mine too. Mine loves 91 or 92grs (depending on the brass used) of R-33 and 230 Bergers at 3040fps. It shoots in the .1's with boring regularity. Your velocity seems low but I think Sierra's have a shorter bearing surface and they will probably take more powder to get the velocity.
     
  14. Ledd Slinger

    Ledd Slinger Gold $$ Contributor

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    The velocities with the 230 Sierras seem to match the Berger 230s or at least they are very close.
     

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