Where can I get a 7 lrm reamer

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Dhughes, Mar 25, 2013.

  1. Dhughes

    Dhughes Well-Known Member

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    I've decided to go with a 7lrm, but my smith doesn't have the reamer and the place he rents them from doesn't either. Anyone know where I can find one?

    Thanks, Daniel
     
  2. Len Backus

    Len Backus Administrator Staff Member

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    Gunwerks.com
     

  3. Dhughes

    Dhughes Well-Known Member

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    Thanks Len. I sent them an email today. I didn't know if they rented them or not. I haven't heard back yet.
     
  4. Len Backus

    Len Backus Administrator Staff Member

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    Rent? Sorry, didn't see that. Doubt it.
     
  5. AZShooter

    AZShooter Well-Known Member

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    I considered making one too. But dropped the idea of making a 7mm LRM when I found out that Gunwerks had exclusive rights to the reamer. I like to own my reamers made to my specifications.


    I ended up making a 7mm/375 Ruger by just necking down the case with no shoulder movement.


    Necking down from 375 to 338 was quite easy. I used a Hornady 338 RCM FL die. (the 375 Ruger and 338 RCM share the same shoulder angle and diameter) I also have a whidden 338 RCM FL bushing die. It was simply a matter of stepping down through various bushings to get to 7mm. This solved the first issue on being able to make the brass.

    I then talked to Dave Kiff at Pacific Tool and Gauge. I knew others had Dave make them a reamer when the 375 Ruger first came out. I asked about the short neck being an issue and he said it wasn't so I had him make me a .317 neck 7mm/375 Ruger reamer.

    I did have to turn the necks and chose .013" neck wall thickness.

    I rechambered two rifles for this new cartridge and have had zero issues. More on the rifles later.

    For dies I decided to try and use stuff I had on hand. I reamed the allignment tube inside a 7mm rem Redding comp die with my reamer for seating. Currently using Whidden 338 RCM FL bushing die for neck sizing. Using a 375 Ruger FL die for body taper. Haven't had to push shoulders back with twice fired brass but when needed I'll use the 338 RCM die for that. So far I am getting low runout.

    More importantly I am getting excellent accuracy with both rifles.

    First rifle is a Mark X in a McMillan with a short 7 rem mag barrel. It is a setback 7mm Rem takeoff that is 23 1/4" long. The other is a 11 lb Mark X in a Russo stock with a 30" 1 in 9 twist fluted SS lilja 6 groove 7 STW takeoff a friend sold me with 200 rnds through it. It is now 29 3/8".
    Both rifles shoot the 180 Bergers.

    Short barreled rifle uses moly coated 180 VLD hunting with 84 grs of RL-33 vel 3075 fps

    Long barreled rifle uses 180 hybrid target with 83 gr of RL-33 vel 3200 fps.

    I am happy with this fun experiment. I am currently trying other combinations with the short barreled rifle. I am certain I'll burn it out with other loads but don't worry as I have three more 7mm rem mag takeoffs I can install. I do all this work myself and it is lots of fun.

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    I suppose you could try to get Gunwerks to allow you to buy a reamer but I'll bet they won't do it. Why should they? They will chamber a rifle you send them. Once you do that you can buy the dies and brass.

    Let us know if they allow you to get one of their reamers.
     
  6. Len Backus

    Len Backus Administrator Staff Member

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    Gunwerks wants the 7LRM to become a popular cartridge for use by all. They will sell brass and reamers.
     
  7. AZShooter

    AZShooter Well-Known Member

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    Thanks for that information Len.
     
  8. Dhughes

    Dhughes Well-Known Member

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    I got an email back from Aaron today. He said I could rent or buy the reamer and headspace gauges from him. He also has brass and dies ready to go.
     
  9. AZShooter

    AZShooter Well-Known Member

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    That is great! The 7mm/375 Ruger and the 7mm LRM are some of the best large 7mms. Enjoy the ride.
     
  10. bigngreen

    bigngreen Well-Known Member

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    I've been researching the 7 LRM and find it interesting, just got more interesting!!
     
  11. MontanaRifleman

    MontanaRifleman Well-Known Member

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    Which would be more cost effective... A 7 LRM or a 7 Dakota?
     
  12. trueblue

    trueblue Well-Known Member

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    7 Rogue
    Travis of R Bros design based on 300 WM case
     
  13. MontanaRifleman

    MontanaRifleman Well-Known Member

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    I'm more of the short beltless case fan. A 7/300 Dakota would have about 6 more gr H2O capacity than a 7/300 WM
     
  14. Dhughes

    Dhughes Well-Known Member

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    I was going to go with a 7 dakota, but didn't want to mess with the bigger bolt face and the brass and dies are higher.