So Guys, What Seven?

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by 7MilMauser, Dec 28, 2010.

  1. 7MilMauser

    7MilMauser Member

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    Thinking about another custom. Im leaning towards the 7mm. I already have a good 700+ yard 7mm rem mag with 160 accubonds. What im after is the 7 rum or the 7 stw with a 1-8 twist so I could shoot the 180 bergers. Is one any better than the other. The Allen mag is a little to overbore. My chioces will be between these 2. Thanks
     
  2. pyroducksx3

    pyroducksx3 Well-Known Member

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    I would look at the 7 RUM and use the 200 ULD wildcats, using 180 you could use the 7 STW. The 7 RUM is not very efficent but will get you about 100+ fps using about 10 grains or so more powder. So if you're looking for the absolute most velocity it will be the RUM. Some people have started again using the 7-300 win mag and are reporting velocities equal or better than the STW. This seems to a super effecient caliber. I believe it was a fiftydriver post where he said using 168 gr use the 7 rem mag, 180 7 stw, 200 use the RUM. He has far more knowledge and expierence than I will ever have so I take what he says with high reguard
     

  3. J E Custom

    J E Custom Well-Known Member

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    Both the 7 STW and the 7 Ultra are over bore cartridges, so if you are going to shoot the big bullets
    go with the big RUM.

    I have both, and the STW will hum the 140s and 160s. but the 7 Ultra does better with the 180s
    because of case capacity and slower burning powder.

    The 1 in 8 or 1 in 9 twist both work in the Ultra mag so If Berger recommends a 1 in 8 go with it.

    J E CUSTOM
     
  4. Firecat

    Firecat Well-Known Member

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    You should check into the 7-300 win Mag. There has been a recent post on it. I must admit that it had me interested. I speaks of the advantages that it has over both the STW and RUM. Just food for thought. Nice thing is that you may be able to use existing 7mm Rem Mag dies for it.
     
  5. freebird63

    freebird63 Well-Known Member

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    For me it would be the STW all the way, not even the 7RUM can push a 140gr factory load to 2550fps at 500 yards, the STW can. Am not sure which one will burn up barrels faster??? I guess it all depends on how hot you load them.
    I have a sendero 300RUM and if I had the money to do it I would get a 28 inch broughton barrel and have it rechambered to a 7MM STW. Heck I even tried to convince myself that I could afford to sell my sendero and get a nice light custom 7mm STW. This is just my opinion.
     
  6. zuba

    zuba Well-Known Member

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    I'm thinking about the 7 dakota. Kinnda right in there...
     
  7. AZShooter

    AZShooter Well-Known Member

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    I think you have it backwards Firecat. The STW has less internal capacity compared to the 7 RUM. If pressures are the same the 7 RUM will beat the STW even with light 140 gr bullets.

    7 MilMauser:

    If you are considering a larger 7mm than the 7 rem mag be sure to get a long barrel. IMO at least 28" if you want to reap the advantages of the larger cases. I'd vote for the 7 RUM with a 30 or 32" barrel if I were to build one. Be sure to get enough twist for the heaviest bullets.

    Be sure to come back and share your results!
     
  8. SidTheKidd

    SidTheKidd Well-Known Member

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    Check out the 7-300 Win Mag. I have one, and it will shoot the 180 bergers right around 3175fps. This was using H-1000.

    Here is a cool article by KiwiNate, a fella on these forums. His is a 7mm-300 Win Mag, with a little different shoulder angle. Read about it, its a good article. He talks about his 7RUM and compares it to the 7mm-300 Win Mag.
    The 7mm Practical. A Practical Magnum.

    Its also easy to wildcat. You dont need any special dies or anything.

    -Sid
     
  9. demo-dan

    demo-dan Guest

    To be realistic, and in my opinion, if your goal is to fire 180 grain loads why be insistent an the 7mm. It sounds like you already have a better than average 7mm and your goals seem to be custom based. Depending on the game your hunting a 700 yard shot is a dream. From experience a .308 round is much more enjoyable to dial in simply due to its versatility. (110 grains to 225)
    My 300 with 150's, 180's, or 200's is like greased sh-----!
     
  10. trebark

    trebark Well-Known Member

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    I kinda agree. Since you already have a 7mag, why not go bigger? 300RUM, 338Edge?? Then you can shoot 210/225 and 300 grain bullets respectively.

    300RUM pushing the 208Amax at 3150...deer killer to 1400 yards.

    338Edge running the 300SMK at 2850...deer killer to 1800.

    Awesome.
     
  11. Firecat

    Firecat Well-Known Member

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    AZShooter, I think that you have me confused with Freebird63. I would agree with your statement and always thought the RUM to be atop the STW in velocity.
     
  12. freebird63

    freebird63 Well-Known Member

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    Or better yet go with the 7.21 Lazz Firebird, its still pushing a 140gr bullet at 500 yards to the tune of 2718 fps. Or the 7MM Dakota is another good one.
    Or go buy a trashed 300RUM and send it to Kirby and have him rechamber it to a 338 edge.
     
  13. AZShooter

    AZShooter Well-Known Member

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    Firecat,

    Sorry about that....
     
  14. yobuck

    yobuck Well-Known Member

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    i have a 7 rem mag, and also a 7x300 weatherby.
    the 7x300 is simply a 300 weatherby necked down.
    its about identicle to the 7 stw as to performance.
    it has a several hundred yard advantage over a 7 rem.
    sort of like owning a 16 oz hammer and a 20 oz hammer.
    my suggestion would also be to get a hammer.
    think 30 caliber.