7mm Long Range Mag

Discussion in 'Big Stuff -- 6.5mm, 7mm, 30 Cal' started by SuperiorRifles, Oct 3, 2012.

  1. SuperiorRifles

    SuperiorRifles

    Joined:
    Sep 19, 2012
    Messages:
    78
    New build in the works! Going with the 7mm LRM, Anyone shooting this round? Performance? This build started out as a 7mm Rem Mag but liked the idea of the non belted case, 30 deg sholder and the longer neck.

    Blueprinted Remington 700 LA .705" Bore
    PTG 1 piece bolt .704" dia
    Shilen #5 SS Match 1-8 twist 26" to 27" finished lenght (first Shilen for me, anyone shoot Shilens?)
    My own SPR muzzle brake.
    SPR Bolt knob
    McMillan A-3 Stock

    I'll be shooting the Berger 180 VLD's and want to try the 195 Hybrids when available (reason for the 1-8 twist)
     
  2. doc gordon

    doc gordon Site $$ Contributor

    Joined:
    Dec 2, 2011
    Messages:
    326
    sounds great!follow up here as i'm thinking this may be my next build.
     
  3. SuperiorRifles

    SuperiorRifles

    Joined:
    Sep 19, 2012
    Messages:
    78
    Will do. Going to load with Retumbo or H1000, I'll try the Retumbo first with hopes of 3100 fps or more with the 180's.
     
  4. jsthntn247

    jsthntn247 Site $$ Contributor

    Joined:
    Mar 9, 2010
    Messages:
    1,168
    3100 is asking allot. 3000 is all you will ever need and will help on brass life. Retumbo should get you where you want though.
     
  5. Larryh128

    Larryh128 Site $$ Contributor

    Joined:
    Nov 4, 2010
    Messages:
    1,407
    I have several Shilen barrels, good quality barrels and have a couple that shoot lights out.
     
  6. SuperiorRifles

    SuperiorRifles

    Joined:
    Sep 19, 2012
    Messages:
    78
    Good to hear! I hope it does well, I have used Scneider, Krieger and Pac Nor but never a Shilen. $239 is worth a try IMO.

    Thanks for the info.
     
  7. tmr

    tmr

    Joined:
    Oct 1, 2006
    Messages:
    14
    Load with H1000. Built a similar wildcat when the 375 ruger case first came out a few years ago. 3100 with a 180 in a 27" barrel was top end. Case forming was a pain in the butt, so I designed a different wildcat on the 300WM case that was much easier to form and cheaper brass. Very similar case capacity and both get 3100-3150 in 27-28" barrels.
     
  8. SuperiorRifles

    SuperiorRifles

    Joined:
    Sep 19, 2012
    Messages:
    78
    I'll give the H1000 a try. I ordered my 7mm LRM cases and the FL sizing die with the neck bushing from Aaron Davidson at Gunwerks. Should be here Monday.
     
  9. rfurman24

    rfurman24

    Joined:
    Jul 7, 2008
    Messages:
    179
    I am very interested in hearing how the 180s perform for you. I built a 7mm WSM on a long action and get 2980 with the 180s from a 25in barrel. This is a mild load but it's where the accuracy is. I would like to know if it will be worth stepping up to the LRM when my barrel burns out.
     
  10. brianc74

    brianc74

    Joined:
    May 23, 2010
    Messages:
    136
    I have a Gunwerks 1000 in 7LRM. My load is H1000 72.0, Fed215M, with Berger 180 VLD loaded to 20 thou off the lands. This load is doing 3050 FPS at 5000 elevation and 50' temp. This is not the hot load.Hope this helps.
     
  11. TonyR

    TonyR

    Joined:
    Feb 24, 2008
    Messages:
    1,691
    What are the dimensions of a 7mm Long Range Magnum? I even tried Googling the thing and got nothing useful.
    Thanks very much.
     
  12. Romulus

    Romulus

    Joined:
    Oct 7, 2011
    Messages:
    257
    Do not intend to hijack this thread, but I'm really surprised by all the h1000 loads out there. Have you guys seen your chrono numbers change a lot in different temperatures? I do not intend rudeness in any way. I had an H1000 load that would "outshoot", as many lean on (in fps), anything in my 284 but it was too volatile for predictive shots across different conditions.
     
  13. jscandale

    jscandale

    Joined:
    Jun 7, 2011
    Messages:
    777
    What is the 7mm LRM? Parent case?

    JS
     
  14. jamesh

    jamesh

    Joined:
    Mar 11, 2007
    Messages:
    338

    375 Ruger
     
  15. Steve Blair

    Steve Blair Site $$ Contributor

    Joined:
    Sep 6, 2009
    Messages:
    4,516
    [br]
    The parent case is 2.580" and holds 99.0 grains H2O. That would be reduced after necking down but it is still a lot of capacity for a 7mm. [br]
    p.s.: Glad to see you are back on the grid, Tony. :)
     
  16. TonyR

    TonyR

    Joined:
    Feb 24, 2008
    Messages:
    1,691
    The power came back on Wednesday morning. We were lucky compared to folks north of us.
    That is a lot of powder! I am buying enough barrels as it is!
     
  17. SuperiorRifles

    SuperiorRifles

    Joined:
    Sep 19, 2012
    Messages:
    78
    Well, I finally finished the work on my 7mm LRM last night (with the exception of waiting on my McMillan A-3 stock due in March 2013). Got up this morning and test fired two shot through the Chrono before heading in to work. 72 grains of Retumbo, 180 Bergers was 3015 fps. I'll work up until I see signs of pressure just to find the max load. My ballistics ap on my phone, has me pretty excited about the performance of this cartridge when I inputted all the info and calculated the down range scope adjustments.
     
  18. M14AMU

    M14AMU

    Joined:
    Aug 30, 2010
    Messages:
    1,168
    You may wish to go here and do some reading:

    http://www.accurateshooter.com/cartridge-guides/7mm/

    I've got a Kevin Rayhill Savage he built up in 7MM WSM about 4 years back and shooting 150 gr. Nosler BTs the damn thing consistently shoots 6" groups from 1000 yds. It ain't no slouch! Load is 61 grs. H4350 with F210M primers and Win cases. Rifle sat in my safe basically up until about a month back but it has proven to be very surprising...to say the least! Has muzzle brake installed which works well.

    [​IMG]
    Savage1000 by Sharps45 2 7/8, on Flickr
     
  19. SuperiorRifles

    SuperiorRifles

    Joined:
    Sep 19, 2012
    Messages:
    78

    Thanks,
    I have read the article, but it doesn't have any info on the 7mmLRM.

    I shot some test loads this morning but had some kind of spurattic readings on my chrono. I did have problems seating the bullets, it seem to take a lot of force to seat the bullets, almost like the necks on the new brass was sized way too small. But after I fired and re-sized some of the brass, the problem was solved. Never had that problem before, anyone ever experienced that before?
     
  20. Steve Blair

    Steve Blair Site $$ Contributor

    Joined:
    Sep 6, 2009
    Messages:
    4,516
    Did you expand the necks prior to loading new brass?
     

Share This Page