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

7 lrm ballistics.?

LinkBack Thread Tools Display Modes
  #1  
Unread 06-13-2013, 02:00 PM
Bronze Member
 
Join Date: Feb 2012
Posts: 67
7 lrm ballistics.?

I have done a search looking for some numbers on the 7 Lrm but haven't found much on it. I know it's pretty new but I figure there are enough of them out there I could get some ballistics on it. I've read on Gun Works web page that it will run the 180 @3100 under 72gr of H1000 in 26 inch tube. That seems like its just a hair hotter than a 7 Rmag.

I've would like to hear from someone that has one what the case capacity is and some known velocities are and what barrel length you are running to achieve them. I'm gonna build a big 7 and its a toss up on weather to build a 7 lrm or 7x300 win mag or version of.

I have most everything I need just need to pick a direction a go. One thing I would like to know is I have a 1-8/5 twist barrel just wondering ho much this would slow either on of them down and what length to run. It's a 31 inch blank.
Reply With Quote
  •   #2  
    Unread 06-14-2013, 06:31 AM
    Silver Member
     
    Join Date: Sep 2012
    Location: Michigan
    Posts: 197
    Re: 7 lrm ballistics.?

    I don't have one, but one benefit of the LRM is there isn't a belt. One downside is limited availiblity of brass.
    Reply With Quote

      #3  
    Unread 06-14-2013, 10:43 AM
    Gold Member
     
    Join Date: Oct 2008
    Location: Wherever the Marine Corps sends us.
    Posts: 674
    Re: 7 lrm ballistics.?

    Another option is a 7/300 Norma Mag. You could even step up to a 190 gr Matrix or 195 gr Hybrid. That will be an amazing combo for anything moose sized and smaller. I'm torn between the 7 LRM and 7/300 NM for my next build. I'd like to know what the LRM can do with the 190 Matrix out of a 28" barrel...
    __________________
    ACTIVE DUTY MARINE CORPS '96-'04
    SERGEANT (MED RET)
    COMBAT ENGINEER, MOUT INSTRUCTOR, RIFLE/PISTOL INSTRUCTOR

    "Be polite, be professional, but have a plan to kill everyone you meet."
    "I come in peace. I didn't bring artillery. But I'm pleading with you, tears in my eyes: If you f*ck with me, I'll kill you all." Marine General Mattis

    Custom built 7mm SAUM
    Reply With Quote
      #4  
    Unread 06-14-2013, 04:33 PM
    Silver Member
     
    Join Date: Jan 2007
    Posts: 164
    Re: 7 lrm ballistics.?

    Quote:
    Originally Posted by JARHEAD1371 View Post
    Another option is a 7/300 Norma Mag. You could even step up to a 190 gr Matrix or 195 gr Hybrid. That will be an amazing combo for anything moose sized and smaller. I'm torn between the 7 LRM and 7/300 NM for my next build. I'd like to know what the LRM can do with the 190 Matrix out of a 28" barrel...
    I have a custom in 7mm Dakota 25" barrel 8.5twist Krieger barrel, I shoot the 190gr Matrix bullets and
    the 180 Hybrids both with H1000 and with retumbo and I get 2960-2975 avg for the 190's and
    3010 for the 180 hybrids. All this with between 72-74.5 grains of powder so I am assuming that
    the 7LRM has almost Identical case capacity as the 7dakota.
    Hope this helps

    Elmer
    Reply With Quote
      #5  
    Unread 06-15-2013, 05:38 AM
    Platinum Member
     
    Join Date: Dec 2005
    Location: Tucson Az
    Posts: 2,023
    Re: 7 lrm ballistics.?

    I have a 29 1/2" lilja 6 groove 1 in 9 twist. The case is the 375 Ruger necked down to 7mm without any changes to shoulder. The 7 LRM has the shoulder moved to lengthen neck so its capacity will be slightly less.

    180 gr Berger hybrid target is going 3175 fps with 83 gr of RL-33.
    Reply With Quote
      #6  
    Unread 01-16-2014, 11:12 AM
    Bronze Member
     
    Join Date: Feb 2012
    Posts: 67
    Re: 7 lrm ballistics.?

    Any updates on the 7lrm?
    Reply With Quote
      #7  
    Unread 01-16-2014, 03:32 PM
    Platinum Member
     
    Join Date: Dec 2008
    Location: rathdrum, id.
    Posts: 5,005
    Re: 7 lrm ballistics.?

    Quote:
    Originally Posted by elmerdeer View Post
    I have a custom in 7mm Dakota 25" barrel 8.5twist Krieger barrel, I shoot the 190gr Matrix bullets and
    the 180 Hybrids both with H1000 and with retumbo and I get 2960-2975 avg for the 190's and
    3010 for the 180 hybrids. All this with between 72-74.5 grains of powder so I am assuming that
    the 7LRM has almost Identical case capacity as the 7dakota.
    Hope this helps

    Elmer
    Those must be fairly mild loads? I'm pretty sure the Dakota holds 6-8 grains more than the LRM.......Rich
    Reply With Quote
    Reply

    Bookmarks

    Thread Tools
    Display Modes



    All times are GMT -5. The time now is 01:15 AM.


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