7-300 Norma Improved project update

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by nodakhunter, Dec 11, 2019.


Help Support Long Range Hunting by donating:


  1. nodakhunter

    nodakhunter Active Member

    Messages:
    35
    Joined:
    Oct 30, 2019
    So after my initial thread wondering about the pros and cons of doing an extreme 7mm build, the 7mm-300 Norma, and receiving a lot of comments that it was a bad idea, I've decided to do a 300 Norma Improved instead. I hear a lot of good things about this cartridge and its ability to push heavy 30 cal bullets. My plan once this is all said and done is to have a fairly lightweight, long range elk killer.

    I'm currently in the process of getting a reamer print (JGS) drawn up. I'm planning to run either the 215 or 230 grain Berger Hybrids (for hunting) and maybe try out Hornady's 230 A-tip for stretching the rifle's legs a little bit. I'm undecided about what to do with the freebore on this rifle. From everything I can find, somewhere around .210-.220" seems to be about right for the 215 and around .260" for the 230 grain class of bullets. Any opinions about which route to go?
     
    djfergus likes this.
  2. Mram10us

    Mram10us Well-Known Member LRH Team Member

    Messages:
    1,844
    Joined:
    Oct 19, 2019
    Have you considered the 250 class bullets?
     
  3. Rhovee

    Rhovee Well-Known Member

    Messages:
    806
    Joined:
    Jun 29, 2017
    IMO 230's. If you have a bullet going over 3100, time to step it down to something bigger. I wouldn't expect much gain from accuracy between a 230 A tip and 230 Berger. I have a 300 NMI and a 338 NMI. I would go .260-.275 FB and try the new 245's and see what you can come up with as well. 215 is a great bullet, but traveling north of 3150 would be a huge mess if shot something within 300 yards.
     
  4. nodakhunter

    nodakhunter Active Member

    Messages:
    35
    Joined:
    Oct 30, 2019
    That's kind of along the lines of what I was thinking. Those new 245s coming out of the barrel around 2950 sound enticing too. Do you have any problems loading the rounds to fit your magazine? Planning to run an Accuracy International CIP length mag.
     
  5. nmbarta

    nmbarta Well-Known Member

    Messages:
    590
    Joined:
    Mar 8, 2014
    Pretty sure Ryan Pierce has that one figured out. You might want to give him a call. Decent chance it'll be tough to come up with a better reamer, but it doesn't hurt to try.
     
    MattK likes this.
  6. GCarlton53

    GCarlton53 Active Member

    Messages:
    40
    Joined:
    Nov 30, 2010
    Since when is overbore a bad idea? A 7-300norma with a 180gr berger. Sounds tasty
     
    nmbarta likes this.
  7. IdahoCTD

    IdahoCTD Official LRH Sponsor

    Messages:
    1,846
    Joined:
    Oct 22, 2008
    Believe it or not it was figured out before Ryan built his first one. Just because the rest of us don't build guns for a living doesn't mean we didn't have it figured out. My reamer was made in 2014 or 2015.
     
    Swamplord and Mram10us like this.
  8. nmbarta

    nmbarta Well-Known Member

    Messages:
    590
    Joined:
    Mar 8, 2014
    Didn't say he was the one that figured it out, I said he has it figured out, meaning that he can build a very nice rifle in that cartridge and do so with the specific bullets optimized in that case that the op inquired about.
    Every time a new cartridge is introduced to the market, hundreds of gun smiths start looking at how to make it better, which is a beautiful thing. It makes hard to know who did anything first.
    There were probably 50 guys, maybe more,that had almost identical ideas within a week of the 300 norma being released.
    You very well may have been among them, and may do just as well or even better for all I know, just never heard of you or your knowledge of this cartridge, so I couldn't have mentioned you.
     
    PAGSDIII701 likes this.
  9. nodakhunter

    nodakhunter Active Member

    Messages:
    35
    Joined:
    Oct 30, 2019
    I know, I know.....just didn't want to risk blowing up bullets, especially in a hunting gun. Didn't want to risk Murphy's law coming into play with a big elk in the crosshairs.
     
    PAGSDIII701 likes this.
  10. Mram10us

    Mram10us Well-Known Member LRH Team Member

    Messages:
    1,844
    Joined:
    Oct 19, 2019
    Reminds me of Carlock getting the credit for the Edge, when it was built by others before him. Granted, both have a good handle on them.
     
  11. IdahoCTD

    IdahoCTD Official LRH Sponsor

    Messages:
    1,846
    Joined:
    Oct 22, 2008
    He gets credit for the name though. Swamplord did his version just before me and I guess because he didn't talk it up and build guns his name didn't catch on. People harassed him enough you don't hardly see him on here anymore.
     
    Mram10us likes this.
  12. Mike from Texas

    Mike from Texas Active Member

    Messages:
    27
    Joined:
    Sep 7, 2013
    Or a Berger 195 EOL.
     
  13. RH300UM

    RH300UM Well-Known Member

    Messages:
    1,047
    Joined:
    Aug 25, 2008
    I run both the 180 hybrids and the 195s in our 7rbh(7/300 NM imp)
    8.4 twist barrel
    195’s @ 3250fps
    180’s @ 3300fps
    Both can pushed faster but accuracy suffers. Also the N570 issue of accelerating throat erosion has put Retumbo in the top slot for now.
     
    GoosePilot, PAGSDIII701 and nmbarta like this.
  14. nodakhunter

    nodakhunter Active Member

    Messages:
    35
    Joined:
    Oct 30, 2019
    What bullets work best for you in the 300 RBH?