Big Sevens... Which one for the 195 Berger.....?

Discussion in 'Firearms, Optics and Accessories' started by 300_BLK, Dec 4, 2016.

  1. 300_BLK

    300_BLK Well-Known Member

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    The next build will be a 7mm of some description for long range hunting.

    I'm a firm believer when deciding on what to build you start with the projectile / calibre then the cartridge chambered to suit said projectile.

    So its the 7mm 195 Berger EOL and 175 ELD-X.

    It will be based on a R700 long action as they have the largest mag box and lots of aftermarket parts.

    The hard bit is the cartridge.

    My initial thoughts are 7mm-300 Norma Magnum with a 30 deg shoulder AKA Long Range Hunter by [MENTION=4843]Swamplord[/MENTION]. Brass looks easy but dies i'm not sure about due to a lack of knowledge.

    View attachment 60198

    This should net between 3200-3300 fps from a 26-28" bbl, which translates to a 1500m rifle (1600fps).

    My question is: Will a RUM or STW or 28 Nosler or 7 LRM / Dakota / 7-375 R, 7mm-338 Lap 7mm-300WSM be easier due to dies and brass availability?

    I already have a 338 Lap and 264 WM so this is a 'want' not a 'need'.

    Cheers,

    F.
     
  2. puku

    puku Addicted

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    I don't think you will see enough speed out of a 7/300wsm. It is barely enough for 180s.
    Your original idea sounds great, but throat erosion will be a factor at those speeds

    Sent from my SM-G900F using Tapatalk
     
  3. camo wsm

    camo wsm Well-Known Member

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    I like the idea of 28 nosler :thumbsup:
     
  4. ChrisF

    ChrisF Well-Known Member

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    7mm Blaser , norma brass ,
     
  5. Shootm

    Shootm If your not fast your last

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    [MENTION=78]Kiwi Greg[/MENTION] would be a good man to talk to.
     
  6. stug

    stug Well-Known Member

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    7 RUM would be good, but you won't fit one in the magazine. Maybe if you extended the magazine a bit. When I had my 7 RUM I used the 180gr Berger hybrid. I had to single feed it, I hadn't extended the magazine. I got 3200 pretty easy with about 100gr US869. I got Greg Duley to rechamber it using his short throat reamer.
    If you want the most velocity I'd try the 7 superfatso from Greg Duley it is based off the 338 lapua and improved. The easiest will be 7RUM.
     
  7. MSL

    MSL Well-Known Member

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    I was using 98gr of us869 for 3275fps with the 180 but now 84gr 2225 for 3245fps. Considered the 195 but need a 1:8 twist and the gains are not dramatic enough for me. Building a rifle from scratch though I'd probably give them a go
     
  8. Sidney

    Sidney Well-Known Member

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    Pardon me for being confused.... but if a 7WSM pokes out a 162Amax at about 3100 for around 62 grains of powder and a 7SAUM does around 2950 for even less...

    Why do we get excited about 180 grain burgers for only a little more speed, 100 grains of powder and a shagged barrel in even less time?:yaeh am not durnk:
     
  9. stug

    stug Well-Known Member

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  10. 6MMBR

    6MMBR Well-Known Member

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    Wow more brains then sence.
    Some body needs to be the foram wanker might as well be me,

    Not getting at you personly ?
    But Wtf are you up to daisy . A 1.6 k hunting rifle ?
    On average i shoot and sell around 1500-2000 roo per year and export them for pet food, 400 is about my max but only use a blk ,

    Im curios , if you build this thing will your 22 inch moa at 1.6 1 moa gun at 100 be accurate enouf for a man with 3 guns that dose not no what he wants and has to asks internet advice to make a decision ?
     
  11. MSL

    MSL Well-Known Member

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    Plenty of people shooting a lot further than 400 at animals a lot gruntier than Roos. There is also a difference between shooting an animal at 1600, and just having a rifle that could do it.
     
  12. Sidney

    Sidney Well-Known Member

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    Nathan Foster does a 7mm Practical which sounds like it maybe could be??
     
  13. stug

    stug Well-Known Member

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    7mm practical is the 300 win mag necked down and shoulder changed. Better than the rem mag, but behind the RUM. I think it is around 80ish grains of capacity/powder.
     
  14. 300_BLK

    300_BLK Well-Known Member

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    So the Gunsmith said RUM's eat barrels at too fast a rate and recommends the 7 LRM / Dakota or 7-375. (personally don't care about Barrel life)

    Would the practical (7 - 300 Win) be the same? or a STW?

    I can / will get a wyats box fitted for a longer magazine.
    [MENTION=1509]6MMBR[/MENTION] I know what I want in terms of performance mate, I'm just smart enough to know what I don't know and defer to those who have already burn't out a few barrels in a big 7mm rig. I have shot goats and wallabies to 1100m mate, just want to go a bit further is all and hopefully its a half moa gun :thumbsup:
     
  15. Sidney

    Sidney Well-Known Member

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  16. Proudkiwi

    Proudkiwi Well-Known Member

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    7mm Practical sounds alright but I hate rimmed cases and I reckon it looks a bit weird.

    7/375 would be my pick.
     
  17. 199p

    199p Well-Known Member

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    Norma

    Sent from my SM-G935F using Tapatalk
     
  18. camo wsm

    camo wsm Well-Known Member

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    Had a 7 lrm and still have two close mates that still run them do about 3k with 180's easily in a 24 inch tube brass is expensive as other than that they're nice I'd go bigger though either 28 nosler or neck down 300 Norma if it was me
     
  19. stug

    stug Well-Known Member

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    If you want velocity then barrel life will suffer. The smaller capacity cases will give slightly more barrel life. The bigger thing will be how you shoot it. Long strings of shots will eat the barrel faster, no matter what the velocity. Kirby Allen on longrangehunting.com had some good info on barrel life in his 7mm Allen magnum, basically a 338 lapua improved and necked to 7mm.
     
  20. Matt2308

    Matt2308 Well-Known Member

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    I think that you are on the right track with the 7-300 Norma.
    Seems about ideal to push the 195's and will be a great long range hammer! [emoji1303]
     

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