7 mm lrm

Discussion in 'Long Range Hunting & Shooting' started by ann brezinski, May 27, 2014.

  1. ann brezinski

    ann brezinski Well-Known Member

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    Can any one give me their thoughts on this case as compared to the 7 mm on the 300 winchester magnum?i am just tring to see if there is a advantage to the 7 mm lrm over the 7 mm on the 300 win mag.
    Gary b
     
  2. jett

    jett Well-Known Member

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    tagged in
     

  3. AZShooter

    AZShooter Well-Known Member

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    From what I have read the two cartridges will give very similar performance.

    After building a 7mm/375, I can say you are stuck with Hornady brass which has shown to be made with different wall thicknesses. Do some searching on some pressure issues guys had with their 7 LRMs and either factory ammo or with Gunwerk's suggested load data.

    With the 300 win mag brass you can choose several manufacturers, RWS being the best. If I had to do it over again I'd make a 7mm/300 win mag instead of the 7mm/375 Ruger
     
  4. fmajor

    fmajor Well-Known Member

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    Interesting topic!!! I'm tagging in....

    Short answer: These two are ballistically very similar so other factors must be used to arrive at the most balanced decision.

    Since you're probably going to be reloading, the next consideration is the ease for sourcing components. In this instance, the most critical component (as AZShooter states) is brass casings.

    Unless you prefer beltless cartridges (such as the 7mm LRM), the 7mm/300 Win Mag chambering uses readily available 300 Win Mag brass which makes it the best choice.

    If do you prefer beltless chamberings, then the 7mm LRM is the better choice.

    On another note.... A while back I was also in the research stage for a "zippier" 7mm chambering (other than my current 7mm Rem Mag). I read a lot about the 7mm STW/RUM/Dakota, but those were all a bit too hot for my liking.

    The 7mm Mashburn/300 Win Mag/LRM all met the criteria I was looking for.

    Essentially, for me the sweet spot for my intended use (up to elk-sized game at max. 600-700yds) was a good 7mm bullet in the 160gr-180gr wgt minimally at 3,100-3,200fps. The 7mm-300 Win Mag for me is the best choice due to ease of sourcing components (I already have 500 300 Win Mag cases).
     
  5. sp6x6

    sp6x6 Well-Known Member

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    Another zipper is a 7mm/Norma off a 338 Norma mag.Standard length action.
     
  6. Boman

    Boman Well-Known Member

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    Sp6x6,

    Do you have a 7mm Norma? I've always thought that would make a great round. Nice brass too
     
  7. Ernie

    Ernie SPONSOR

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    I use both the LRM and the Dakota.
    I tend to lean toward 7mm myself.
     
  8. Dick Tinsley

    Dick Tinsley Well-Known Member

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    There was a gentleman on here that built one! Started out named the 284 Jazz then renamed it to 284 Thor! Pretty impressive!!! Lots of giddy up go!!! Still havnt ruled one out!! Beltless I think! Also. If they ever come out with the 26 nosler, there are some already making plans for a 284 nosler! Just something to consider.

    DT
     
  9. Navaluk

    Navaluk Member

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    I went back and forth between 300 win, 7mm rem mag and 7 LRM. For me I decided to toss the 300. Why? 70% because of kick, 30% because of bullet selection BC. Then I compared the 2 7mms and just decided a semi wildcat was something I was ready to try. As a brand new baby long range shooter (BNBLRS), my decisions probably don't fit most of you.

    I pick up my L-1000 next week at Gunwerks. It will at least be a good starter gun and maybe much more as far as long range shooting goes.
     
  10. HuntFarther

    HuntFarther Well-Known Member

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    From what I have seen it is easier to get accuracy and velocity of 3100 fps out of the 7-300 than the lrm. And with a with a 28" barrel and rl 33 can hit 3200 fps with the 7-300. My vote is the 7-300.
     
  11. .284

    .284 Well-Known Member

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    I've just finished working up a load with my 7-300wm. 27 inch tube 9 twist benchmark is shooting the 180 Bergers at 3120 using h-1000. After I found my load I made some more rounds using never fired brass that I necked down and it shoots the same as once fired brass.
    I'd have to say 7-300 for sure and if / when Berger comes out with the 195 grain 7mm that case is gonna be just about perfect for that bullet.
     
  12. deadlift

    deadlift Official LRH Sponsor

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    I'm in for the 7mm Dakota, it's a hell of a round! I've shot it to 1400 yds with repeatable accuracy out of a heavy hunting rifle (12.4LBS) Its always reliable and feed flawlessly. I feed mine the 190 Matrix Ballistics, but with jackets uavailable I'm headed to the berger 180.
    Chris
    Benchmark Barrels
     
  13. Ernie

    Ernie SPONSOR

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    Little OT, but just want to give a shout out to Chris @ Benchmark Barrels.
    I have one of their 8T, 6.5 barrels in a 6.5 Leopard center-grip XP-100 specialty pistol and it is an awesome barrel!

     
  14. .284

    .284 Well-Known Member

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    I'd have to agree that all my benchmark barrels have been great shooters as well. That's all I'm using from now.

    Had the 7-300 out to 1312 yards yesterday. 29.75 Moa. The kestrel Horus called for 31.3 Moa. Very impressed with the kestrel as well.