243 for long range hunting

Discussion in 'Member Introductions' started by 03Rick, Feb 19, 2011.

  1. 03Rick

    03Rick Active Member

    Messages:
    32
    Joined:
    Feb 18, 2011
    Looking for info on a 243 270 Win. imp for long range hunting for deer and antelope with the 115 Berger and 117 Matrix bullet. Also the best rifling twist and optic and rect. for same.
     
  2. ICANHITHIMMAN

    ICANHITHIMMAN Well-Known Member

    Messages:
    4,380
    Joined:
    Jan 31, 2008
    I think you mean a 6mm-06AI. I dont have any info on it but maybe if you try a search with 6mm-06 you will turn up some results. The BC on thouse Bergers is over 500 very nice.
     

  3. SBruce

    SBruce Well-Known Member

    Messages:
    1,786
    Joined:
    Oct 31, 2009
    There is also a 115 DTAC bullet, available from David Tubb.

    Still some argument on what twist is needed for these heavy 6mm bullets, because they are relatively new. Tubb was using 7.5 twist last I heard. Some guys are using 8 twist rates.

    You'll find many opinions on optics and reticles. Personal preference really. I use NightForce or Leupold optics. I like the NF NP-R1, NP-R2 and Leupold TMR (on the 8-25X Mark4)
     
  4. 03Rick

    03Rick Active Member

    Messages:
    32
    Joined:
    Feb 18, 2011
    Thanks for the optic info. Being an more mature person now my eyes aren't what they used to be and I agree with the extra mag. on the top end. Do you use a 20 MOA for long range on your scopes?

    About the twist, it is a fairly big investment for a barrel and I would like to hit it on the head the first time if possible. The loading programs I have list a twist of 7.5" and 8.3" for 115 grain bullets.

    Does anyone know how critical twist is for accuracy if it is only .5" diff.?
     
  5. SBruce

    SBruce Well-Known Member

    Messages:
    1,786
    Joined:
    Oct 31, 2009
    A few of my rifles have 20min bases, a few do not. Most have a scope with some sort of holdover/windage reference on the reticle (Leupold's TMR for example).

    That's where the argument comes in. I believe those bullets are right on the fence between those two twist rates. David said that he discovered 8 wasn't quite enough for his 115 DTAC. Alot of people are using 8 though. Fact is, David was using 8 until some particular match.??

    Guess it depends on your possibilities, if you know for fact that you really want to shoot 115's/117's and will try all of them before dropping bullet weight, I'd go 7.5, If you're willing to also shoot 95's and 105/107's........8 is plenty fast. If I were a betting man, I'd bet 8 twist will do it from the 6-06 Improved, just because it's faster than David Tubb's 6XC.

    Maybe some others will chime in on this. If not, you could try another thread labeled something like "what twist rate do I need for 6mm 115 grn bullets" I bet you'd get lots of opinions.

    Good Luck:)
     
  6. trebark

    trebark Well-Known Member

    Messages:
    3,475
    Joined:
    Jan 16, 2008
    Given that the jury is still out on the appropriate twist for a 6-06AI shooting 115grain bullets, let me suggest the 6.5mm-06 or 6.5x284 or 260Rem. The 6.5mm bullets have an awesome BC (140grain VLD = .612) and it's well known that the heavy 6.5mm bullets shoot well with a 1:8 twist.
     
  7. 03Rick

    03Rick Active Member

    Messages:
    32
    Joined:
    Feb 18, 2011
    Thanks for all your advise. It is snowing here tonight and will give me time to ponder the 243-264s' ideas again. I might be back at the drawing board again. I am narrowing in on the optics thou.

    When I do zero in on a cartridge does anyone have any leads for a gunsmith near my north AZ location that can do the barreling and drill and tap the scope mount holes in the receiver?

    R
     
  8. trebark

    trebark Well-Known Member

    Messages:
    3,475
    Joined:
    Jan 16, 2008
    No need to let state-lines govern your choice of gunsmith. You can ship your work to the gunsmith of your choice. I would highly recommend Kevin Cram of Montour County Rifles to you. www.montourcountyrifles.com

    He built my 260....

    http://www.longrangehunting.com/forums/f53/my-260-mcr-59628/

    Accurized my nephew's 270....

    http://www.longrangehunting.com/forums/f53/nephews-transformed-rifle-53634/

    And very soon he will be finished with my 300RUM.
     
  9. 03Rick

    03Rick Active Member

    Messages:
    32
    Joined:
    Feb 18, 2011
    Thanks for the lead. I emailed them for more info on twist and smithing costs.

    R
     
  10. mustang58

    mustang58 Well-Known Member

    Messages:
    226
    Joined:
    May 22, 2010
    The velocity also plays a role in bullet stabilization. The faster the velocity the slower the twist that will stabilize it. I'm sure there are limits. You probably won't know velocity for sure until you have the rifle and have a load worked up for it. Just some thoughts.
     
  11. 03Rick

    03Rick Active Member

    Messages:
    32
    Joined:
    Feb 18, 2011
    After reading your posting I want back to my Load From A Disk program and looked at the 105 gr. Berger slowed it down to 3000 fps and the twist section indicated that a 1:8 would stabilize it as well as the 115/ 117 gr. Bullets at 3500 fps. That would provide a varmint load in the 105 grainer out to 550 yds. and a deer and antelope load out to 1,000 yds. with the 115/117 grain bullets. This would also put the 105 grainer in the low recoil range for the times when my wife shoots it. Synergism at work here.

    Thanks for the ideas.