6.5mm-06 ballistics

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by JPH, Oct 18, 2008.

  1. JPH

    JPH Active Member

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    Hello All: Given your experience, can anyone approximate the expected velocity of 130 or 140 gr bullets out of a 25", 9 twist barrel in 6.5mm-06?

    Any load information you might be willing to share is also appreciated. Thanks to all.
     
  2. Ridge Runner

    Ridge Runner Well-Known Member

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    Nosler number three lists data, I have it scanned on my computer, send a blank email to james720603@HardyNet.com with 6.5 data in the title bar and I'll fire it off to ya
    BTW the data calls for around 2800 with a 140, no listing for the 130's though.

    the rule of thumb seems to be, 6.5/06/140/2800-2900, 6.5/06AI/140/3000-3100, 6.5 Gibbs/140/3100-3300 (depending on barrel lengths), my personal gibbs sends 140 bergers downrange at 3250.
    RR
     
    Last edited: Oct 19, 2008

  3. JPH

    JPH Active Member

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    Thanks for your post. I have plenty of reloading manuals, thanks. Given I currently have 2 super 300 mags and a 30-06, I'm looking for something in .264 with it's superior ballistics when compared to .257 and .270, and .270 is very close to my 30-06 with lighter bullets.

    Essentially I want to duplicate 270 Win velocities with .264 bullets; 130 gr Scirocco at about 3150 FPS and 140 gr Partition at about 3025 FPS. I'd like to stay away from wildcats if possible and it sounds like you suggest I can't achieve these ballistics with a 6.5-06. Is there any other option other than belted 264 winchester magnum?
     
  4. 3006savage

    3006savage Well-Known Member

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    JPH you may want to consider the 6.5-284. I think norma makes brass and savage makes a target rifle (single shot I think). Its accuracy is certainly well documented in 1,000 yard competitions.
     
  5. Ridge Runner

    Ridge Runner Well-Known Member

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    this is just my opinion, but I think if you go with a broughton 5C barrel 26-28" long, throat it pretty long and use lapua brass, I'm pretty sure you could push a 140 to 3100+ in a 6.5/06 AI.
    If I had it to do over again I would go that route, the kreiger 8 twist on my gibbs is a fine barrel shoots anything very well but it is a lil slow compared to a broughton or hart due to being a cut rifled barrel. and the 6.5/06 AI brass are easier to form, just neck them to 6.5 or else use 25/06 brass, load'em and shoot'em. about any 6.5 that matches 270 velocities other than the 264 wm is a wildcat.

    since there is no way you can match the velocity of a 270 with an 06 based case with the same weight bullet of smaller diameter at the same pressure, you either must shoot more pressure or use a longer barrel. to give you an idea of how the gibbs outperforms the others with the same case here is a gibbs round compared to a 270 case
    [​IMG]
    Its basicly a 270 necked to 6.5, shoulder moved foreward to give more capacity and changed to 40 degrees
    RR
     
    Last edited: Oct 19, 2008
  6. JPH

    JPH Active Member

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    RR: Thanks for taking the time to type your posts. I did notice than Midway had 6.5 Gibbs brass for sale. JPH
     
  7. Ridge Runner

    Ridge Runner Well-Known Member

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    yep they do, but I can use win brass, and make them using unique powder and corn meal for 1/4 the cost. I have no idea what the "quality" of quality cartridge co brass is.
    RR
     
  8. JPH

    JPH Active Member

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    With plain ole 6.5-06, is there a slight powder capacity advantage with the cartridge using the longer neck of the .270 case necked down vs. the shorter 25-06 case necked up? Obviously, when chambered, the longer neck can be incorporated if using the 270's longer case. Thanks!
     
  9. Ridge Runner

    Ridge Runner Well-Known Member

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    JPH, not much capacity gained but the 270's .046" longer neck does give more support to those long high BC bullets, which is why ray romain, though the 6.5 gibbs was originaly designed around a 30/06, used the 270 case as the basis for his reamer, he's built 36 of them for members of the pa 1000 yard BR club.
    RR
     
  10. JPH

    JPH Active Member

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    It looks like the European 6.5mm x 64 Brenneke is an exact copy of the 270 with the long neck that was reduced to .264. This seems like exactly the ballistics I seek. Is this a viable rifle caliber for an American hunter/shooter? Where can both a reamer for chambering and brass be acquired from the US?
     
  11. RockyMtnMT

    RockyMtnMT Official LRH Sponsor

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    I had one built this summer for my son. McGowen barrel 24", 1 in 8.5 twist. Shooting the 130grn Scirocco over 49grn Hybrid 100 powder at 2950fps. Very comfortable as far as pressure. Shot it to 3100 during load development and pressure was still ok. Using Win 25-06 brass.

    Hope this helps.

    Steve