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Author Topic: 7mm Long Range Mag  (Read 13758 times)

Offline SuperiorRifles

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7mm Long Range Mag
« on: 08:57 PM, 10/03/12 »
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  • 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)


    Offline doc gordon

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    7mm Long Range Mag
    « Reply #1 on: 12:02 PM, 10/04/12 »
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  • sounds great!follow up here as i'm thinking this may be my next build.

    Offline SuperiorRifles

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    7mm Long Range Mag
    « Reply #2 on: 12:40 PM, 10/04/12 »
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  • sounds great!follow up here as i'm thinking this may be my next build.

    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.


    Offline jsthntn247

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    7mm Long Range Mag
    « Reply #3 on: 08:53 AM, 10/05/12 »
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  • 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.

    Offline Larryh128

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    7mm Long Range Mag
    « Reply #4 on: 09:12 AM, 10/05/12 »
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  • I have several Shilen barrels, good quality barrels and have a couple that shoot lights out.

    Offline SuperiorRifles

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    7mm Long Range Mag
    « Reply #5 on: 09:29 AM, 10/05/12 »
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  • I have several Shilen barrels, good quality barrels and have a couple that shoot lights out.

    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.


    Offline tmr

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    7mm Long Range Mag
    « Reply #6 on: 10:12 AM, 10/05/12 »
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  • 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.

    Offline SuperiorRifles

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    7mm Long Range Mag
    « Reply #7 on: 11:37 AM, 10/05/12 »
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  • 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.

    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.

    Offline rfurman24

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    7mm Long Range Mag
    « Reply #8 on: 01:43 PM, 10/29/12 »
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  • 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.

    Offline brianc74

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    7mm Long Range Mag
    « Reply #9 on: 07:55 PM, 10/29/12 »
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  • 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.

    Online TonyR

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    7mm Long Range Mag
    « Reply #10 on: 03:59 PM, 11/01/12 »
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  • What are the dimensions of a 7mm Long Range Magnum?  I even tried Googling the thing and got nothing useful.
    Thanks very much.
    TonyR

    Consistent long range accuracy is the sum of many things, some large and some small.

    Offline Romulus

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    7mm Long Range Mag
    « Reply #11 on: 04:07 PM, 11/01/12 »
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  • 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.
    “Barring love I'll take my life in large doses, alone--rivers, forests, fish, grouse, mountains. Dogs.”  - Jim Harrison

    Offline jscandale

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    7mm Long Range Mag
    « Reply #12 on: 07:22 PM, 11/01/12 »
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  • What is the 7mm LRM?  Parent case?

    JS
    www.keystoneaccuracy.com
    serving the discriminating rifleman

    Offline jamesh

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    7mm Long Range Mag
    « Reply #13 on: 10:02 PM, 11/01/12 »
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  • What is the 7mm LRM?  Parent case?

    JS

     
    375 Ruger

    Offline Steve Blair

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    7mm Long Range Mag
    « Reply #14 on: 10:20 PM, 11/01/12 »
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  • What are the dimensions of a 7mm Long Range Magnum?  I even tried Googling the thing and got nothing useful.
    Thanks very much.


    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.

    p.s.: Glad to see you are back on the grid, Tony. :)
    Sleepygator

     

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