195 grain 7mm Berger - How Much Cartridge Will it Need?

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by buckbrush, Dec 10, 2013.

  1. buckbrush

    buckbrush Well-Known Member

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    I was thinking of a 284 or a 280 AI to stay with a standard bolt face. Any thoughts on whether either of these have enough horsepower to take advantage of these bullets?

    Thanks
     
  2. calib

    calib Well-Known Member

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    I am not real familiar with the 280's, but a quick look at some reloading info on line you could push them, but I don't think the 280 or ai version would be ideal. I have been running the 180 berger at 3170 and am hoping when the 195 decides to show its face i will be able to do 3050 or so out of the 7-300 win and if you ask broz what he would run those out of he will say the 7-300 win
     

  3. AZShooter

    AZShooter Well-Known Member

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    On the other hand the G7 BC of .406 helps carry this bullet.

    I crunched some JBM numbers for 4000 ft ( the elevation I usually shoot) with the bullet lumbering along at 2600 fps. It had 8.8 inches of drift at 500 yds in a 10 mph crosswind. That has it beating the wind drift of my 257 Weatherby with 110 accubonds going a bit over 3700 fps by 1.6". Energy is not great but it is just under 2000 ft/lb

    At 975 yds it still is moving at 1903 fps which might be the threshold of reliable expansion. If 2000 fps is the borderline it is doing that at 825 yds.

    If you were to build a long barrel with enough twist the 195 might do quite well. Sure you would be doing some turret twisting but you wouldn't have too many issues wind drift.

    Who knows, with the right powder the 195 might even go 2700 fps or more from a 30" barrel and the 280 or 284 win.
     
  4. bigngreen

    bigngreen Well-Known Member

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    I'm thinking that a 7 LRM or the 7-300 Win will be ideal, maybe a healthy dose of R33 under it gun)
     
  5. joeycoates

    joeycoates Well-Known Member

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    So do you guys thin a 1:9 would stabilize it or would the twist have to be more aggressive than that?
     
  6. minute of elk

    minute of elk Well-Known Member

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    As soon as I can get my grubby little mitts on some I'll let you know if they work out of a 7saum with a 3 groove 9 twist benchmark ;)
     
  7. Edd

    Edd Well-Known Member

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    Berger says 8.5" minimum.
     
  8. royinidaho

    royinidaho Writers Guild

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    My thot's would be the 7mm Allen Mag would get the most out of it.

    Just sayin'
     
  9. supercrossbmx69

    supercrossbmx69 Well-Known Member

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    In order to send 195's at any velocity, You need the bullets first!!!
     
  10. Lefty7mmstw

    Lefty7mmstw Well-Known Member

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    +1
    and as long as the shelves are empty, they don't have to drum up business with new offerings.
     
  11. FEENIX

    FEENIX Well-Known Member

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  12. joeycoates

    joeycoates Well-Known Member

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    Matrix claims that a 1:9 twist will work with the 190gr bullets, and when you plug the numbers into Berger's calculator a 195gr is plenty stabilized (over 2.0) out of a 1:9 at any altitude and I tried it down to 2600fps.
     
  13. Edd

    Edd Well-Known Member

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    I must need a new computer. I get a 1.32 SG at 3000 fps with a 9 inch twist. It takes a 7 inch twist for me to get the numbers you are getting.
     
  14. MudRunner2005

    MudRunner2005 Well-Known Member

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    No, you will need an 8.5 twist @ minium, probably a 1:8 would be ideal if that is the only bullet you plan on shooting.

    However, keep in mind that this bullet has been talked aout for 2 years now, and we still haven't seen it. I'm not holding my breath, and I'll just stick to my 180's. LOL