Best freebore and jump 55 Bal Tip

Discussion in 'Main Message Board' started by 370bc, Jul 11, 2018.

  1. 370bc

    370bc

    Joined:
    Jul 1, 2007
    Messages:
    581
    I am getting ready to order a barrel (or reamer if need be) in 6-284 for 55 grain Nosler ballistic tips. What would the optimum reamer jump for this system? The general size for reamer makers have on hand is .060 of jump. I don't have my brass (lapua) or dies (redding bushing) yet.
    I have talked to other 6-284 owners and they use zero freebore. Will I be losing a lot from the get-go by starting .060'' off? This will be a fire breathing, barrel-eating cartridge for blaming coyotes, slow firing always. Will a zero jump reamer be worth the $$ in barrel life? Thx!
     
  2. 22DASHER

    22DASHER Gold $$ Contributor

    Joined:
    Jul 16, 2010
    Messages:
    1,358
    You will want a zero freebore. That thing will be a .200 freebore before you know it.
     
    okie and urbanrifleman like this.
  3. urbanrifleman

    urbanrifleman Gold $$ Contributor

    Joined:
    May 25, 2016
    Messages:
    1,427
    Going for 5000 FPS and about 500 round barrel life before it is smooth bore :)
     
    370bc likes this.
  4. urbanrifleman

    urbanrifleman Gold $$ Contributor

    Joined:
    May 25, 2016
    Messages:
    1,427
    Just curious, what would this be for?
     
  5. 370bc

    370bc

    Joined:
    Jul 1, 2007
    Messages:
    581
    Coyote sniping from distance.
     
  6. Alex Wheeler

    Alex Wheeler Gold $$ Contributor

    Joined:
    Feb 5, 2011
    Messages:
    5,902
    I would not plan to jump that bullet. In the dashers and br I have shot it in, it does not shoot well jumped. I would suggest a zero freebore with a 2 degree lead angle. What kind of velocity do they see in that case? A dasher will do 4000 fps with 33-35 grains of powder.
     
    270WinDude and AckleymanII like this.
  7. AckleymanII

    AckleymanII Gold $$ Contributor

    Joined:
    May 11, 2006
    Messages:
    2,216
    Yeppers, my Long barrel 6 Dasher and 6 BRX is doing 4100+ at the accuracy node with the 55's, loves the 60g Sierra at 3900, I am shooting AA2230 with a 7 1/2 primer.
     
  8. 370bc

    370bc

    Joined:
    Jul 1, 2007
    Messages:
    581
    So if I can’t find one to rent, it would be $$ well spent having a reamer made?
    I’m hearing just under 4300 fps.
     
    Last edited: Jul 11, 2018
  9. 22DASHER

    22DASHER Gold $$ Contributor

    Joined:
    Jul 16, 2010
    Messages:
    1,358
    I would if you are going to be shooting this rifle regularly because you will go through a few barrels. Otherwise stick with the .060 fb that is available to you and shoot some 87 grain v-maxs. They will be much better at "coyote sniping from distance" anyways.
     
  10. 370bc

    370bc

    Joined:
    Jul 1, 2007
    Messages:
    581
    My ballistics program says a 300 yard zero @ 4270 FPS 2.7”” high @ 175 yards. 6.5”” low @ 400 yards. I need all of the help/speed I can get.
     
  11. expiper

    expiper

    Joined:
    Nov 23, 2004
    Messages:
    2,163
    most of the older shooters "have Had" 6x284's and there is a reason the dont have one any more,,,they just arent practical,,,,as stated above the Dasher (or even a .243) will give "almost" as much velocity, and when using a bullet with a BC of .2xx just a few yards and the velocity is gone,,,,,and with the price of a bbl at 300+ for a blank and 200+ for smithing you are just spinning your wheels,,,,just some fatherly advice from an old Codger,,,,,Roger,,,hahaha
     
    370bc likes this.
  12. AckleymanII

    AckleymanII Gold $$ Contributor

    Joined:
    May 11, 2006
    Messages:
    2,216
    Also, 370 BC, run a program on a 70g at 4100 with a zero freebore. The 69g Berger 6mm bullet is an excellent coyote bullet, works well with zero freebore. I shot the 69's in a 6/250 AI(3800) and a 243 AI(3850), 70g Nosler in 6 Rem AI at 4100. 69 needs a 12 wist.

    I liked to sight in half inch high at 200, aim at the top of their backs if they are out there a ways....need something simple as you have only split seconds to acquire target as they work through terrain with brush.

    Good luck!
     
  13. 370bc

    370bc

    Joined:
    Jul 1, 2007
    Messages:
    581
    Yeah, the trend hasn’t gone unnoticed for me as people do move from the 6–284 and go to the Dasher of some type. Just for my first wildcat, I want to go with the simplest case forming and using Lapua brass at the same time. I’ll probably do just the same as everyone else. I’m no better.
     
    Last edited: Jul 11, 2018
  14. JRS

    JRS Gold $$ Contributor

    Joined:
    Mar 3, 2008
    Messages:
    6,480
    The "simplest" is the 243.
     
    370bc and urbanrifleman like this.
  15. Alex Wheeler

    Alex Wheeler Gold $$ Contributor

    Joined:
    Feb 5, 2011
    Messages:
    5,902
    I think a 6-284 with 105s or 115s a sweet round. I have a couple guys here local that use them to shoot steel to 1200. 18 moa to 1k is not bad.
     
  16. urbanrifleman

    urbanrifleman Gold $$ Contributor

    Joined:
    May 25, 2016
    Messages:
    1,427
    Agreed. A 243 shooting 70 grain bullets to nealry 4000 is plenty. I haven't even tested 55 grainers yet because my 6BR is shooting them 3900 FPS.
     

Share This Page