Question for 7mmRUM shooters

Discussion in 'Reloading' started by James Jones, Jul 11, 2006.

  1. James Jones

    James Jones Well-Known Member

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    How fast do you think its possible to drive a 160gr calss bullet?
    what about the 180's??

    this will be from a 28" 3 groove Lilja 1-9 twist
     
  2. sambo3006

    sambo3006 Well-Known Member

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    I have a 26" LSS and I was able to get 3500 fps with the 140BT and 3400 fps with the 150BT. Above these velocities I got extractor marks, flat primers and a big velocity jump for small powder charge increase. I would say 3300 fps with the 160AB in my gun.
    Interestingly, I got the best velocity from IMR 7828. I also tried H1000 and got pressure signs at lower velocity.
    With 2" more tube and heavier slugs, H1000 or RL25 might be just the ticket for you. I would think that you could safely get 3400 fps with the 160 from your 28" tube.
     

  3. speedbump

    speedbump Well-Known Member

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    JD, I've shot 156gr Cauterucio VLDs from a 30" tube with good results. Never chrono'd them, but SPEEEEEEEDY. They'll get to 1K in about one second flat. Literally.

    My match load is with a 176 VLD from the same maker at 3,360fps. Both were fired with 5010 pulldown powder from www.gibrass.com . I've tried many powders, & 5010 does the best in THIS rifle, followed by Retumbo.
     
  4. distantfoe

    distantfoe Well-Known Member

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    I've been wondering the same thing, except I'm leaning toward the 180-200gr bullets.
     
  5. duckinalaska

    duckinalaska Well-Known Member

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    I will tell you that if yuo use 94 grains of retumbo you will be at 3400+ fps with 160 grain accubonds.
     
  6. 257speed

    257speed Well-Known Member

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    180 bergers, retumbo, 28" Krieger, 3250fps (warm load)
     
  7. ceg1963

    ceg1963 Well-Known Member

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    Sambo hit the nail on the head (IMR 7828 & 160 NABs)

    In my rifle, a dose of 87g of IMR 7828 loaded at OAL 3.68" does the best with the 160 NABs. 87g of 7828 get me 3350 FPS and one hole at 100, 3/4" at 300, and 3" at 500 yds (with 2100 Foot pounds of Energy at 5).

    Keep in mind that this is a carry rifle... not a heavy rifle: it has a S/S, #5 contoured, 27" fluted Shilen barrel, action is all trued up, a jewell, a McMillan Classic stock, a Zeiss Conquest at 4.5x14.

    All total it only weighs in at 8.5 lbs.

    With 140g NABs, and 91 g IMR 7828 it gets me comfortably 3600 FPS with very similar accuracy and has 2045 Foot Pounds at 5.

    The difference between the 140 & 160 at 800 yds: the 140 g NAB retains about 1300 FP... whereas the 160 NABs retains 1400 FP.

    I guess it is according to what you want to kill.

    v/r
     
  8. distantfoe

    distantfoe Well-Known Member

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    Anyone tried the 200gr Wildcat out of the 7 rum???
     
  9. davewilson

    davewilson Well-Known Member

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    i've shot the 200's out of a 30" 7 twist. 2900 was my accurate speed. this was with 872 powder.i'm sure it would shoot faster with retumbo or another powder. the 180 bergers were around 3250 with the same powder.
     
  10. distantfoe

    distantfoe Well-Known Member

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    Thanks for the info, Dave. Wow, in either situation they are hard to beat for a cartridge that doesn't invove fireforming.
     
  11. davewilson

    davewilson Well-Known Member

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    you're doing the right thing with the 9 twist. go with the 175,176, and 180 bullets. find the best one for your gun and don't look back.