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7 mm lrm

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Unread 05-27-2014, 10:04 PM
Bronze Member
Join Date: Feb 2008
Location: pa
Posts: 74
7 mm lrm

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
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    Unread 05-28-2014, 03:28 AM
    Silver Member
    Join Date: Feb 2006
    Location: Eastern NC
    Posts: 242
    Re: 7 mm lrm

    tagged in
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    Unread 05-28-2014, 06:55 AM
    Platinum Member
    Join Date: Dec 2005
    Location: Tucson Az
    Posts: 2,018
    Re: 7 mm lrm

    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
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    Unread 05-28-2014, 10:04 AM
    Gold Member
    Join Date: Oct 2009
    Location: USA
    Posts: 517
    Re: 7 mm lrm

    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).
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    Unread 05-28-2014, 08:27 PM
    Platinum Member
    Join Date: Dec 2009
    Location: NW MT
    Posts: 3,075
    Re: 7 mm lrm

    Another zipper is a 7mm/Norma off a 338 Norma mag.Standard length action.
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    Unread 05-31-2014, 08:33 PM
    Platinum Member
    Join Date: Sep 2002
    Location: colorado
    Posts: 1,061
    Re: 7 mm lrm


    Do you have a 7mm Norma? I've always thought that would make a great round. Nice brass too
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    Unread 05-31-2014, 09:51 PM
    Join Date: Jun 2007
    Location: Wyoming
    Posts: 2,815
    Re: 7 mm lrm

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