Quantcast

Oh gawd not another Valkyrie post...

Discussion in 'Handloading and Reloading' started by Orcon, Jan 28, 2019.

Tags:
  1. TheDomFather

    TheDomFather Member

    Joined:
    Feb 22, 2017
    Messages:
    460
    Here is the .224 Valkyrie product Manager from Federal talking about the bad PTG reamers with too long of a freebore and the issues it created!
     
  2. Orcon

    Orcon Member

    Joined:
    Aug 25, 2015
    Messages:
    837
    Location:
    Sidney, MT
    Okay, after waiting on UPS to finally get back to work and then spending a week in the hospital with the little person, I finally got to load some Valkyrie ammo. After deburring flash holes, uniforming pockets, expanding necks and applying a light chamfer, my brass was ready to go. I have to say, this Starline brass is not impressing me one bit. The first bullet I seated felt like dragging a plastic sled full of firewood across a gravel driveway. So naturally, I pull the bullet to take a look, scored the entire length of the shank. I bust out the expander die and re-work all the necks and chamfer a bit deeper, seemed to help some but I can feel that there is a distinct lack of consistency in neck tension. Some bullets glide right in and others require noticeably more force to seat and are .01" longer to the ogive. It's almost like they forgot to anneal the brass one last time before sending it out the door.
     
    Last edited: Feb 11, 2019
  3. LRDGCO

    LRDGCO member

    Joined:
    Jul 11, 2018
    Messages:
    689
    You didn't mention full length resizing the brass. FWIW, I always full length resize new brass and then trim, etc. etc. But that brass does sound somewhat brittle from your description.
     
    Toprudder likes this.
  4. Toprudder

    Toprudder Member

    Joined:
    Aug 19, 2014
    Messages:
    2,719
    Location:
    Raleigh, NC
    I assume nothing about the condition of new brass. I treat it just like brass fired from someone else’s gun.
     
    TheDomFather, LRDGCO and Demi-human like this.
  5. Blue68f100

    Blue68f100 Member

    Joined:
    May 25, 2011
    Messages:
    5,325
    Location:
    Piney Woods of East Texas
    I full length size new brass with a few exceptions. Starline recommends at a min of running a expander through the necks to true them up and to remove the preservative that is on them. With this coating you are going to have different neck tension. It would not hurt to run them through cleaner like any fired brass. I used a expander but I also used some solvent before hand. And yes you will have different neck tension due to variation in neck wall thickness. The only way to fix this is to turn the necks, which I did.
     
    Demi-human, Toprudder and Bfh_auto like this.
  6. carnaby

    carnaby Member

    Joined:
    Feb 25, 2004
    Messages:
    1,375
    Location:
    Bellingham, WA
    There's a lot of info about out of spec chambers online that is 100% wrong, especially the method that is described to measure freebore using a flat based bullet turned backwards or .224 inspection pin. All this method does is measure the OAL of a cartridge with the bullet touching the point in the leade that is at most 0.224" in diameter. The freebore is 0.2246" in diameter at a minimum so the inspection pin will not touch any point in the freebore of the rifle chamber.

    The freebore minimum diameter is 0.2246, and the leade is cut at 1.5 degrees. A little trig shows that the distance down the bore going from .2246 to .224 at 1.5 degrees is (remember to turn diameter into radius) 0.0006 / 2 / sin(1.5 deg) = 0.0003 / 0.02618 = 0.01147 or about 11.5 thou. JGS says their reamers are +0.0005 in diameter so they could see up to 0.00055 / 0.02618 = 21 thou for the perfect 0.224 inspection pin down the bore. SAAMI spec has diameter tolerances of 0.002", so if we had an absolute SAAMI max chamber with a freebore diameter 2 thou bigger in diameter than minimum, or 0.2266" (radius = 0.1133") then we would see even more jump. so take (.2266 - .224) / 2 = .0013 and divide by sin (1.5 deg) = 0.0013 / 0.02618 = 0.0497 which is almost 50 thou and the chamber is still "in spec".

    You can take a cavity back bullet and machine the base off to the "sealtite" band, which is right around 0.225" in diameter, and use a Hornady OAL gauge tool to measure the length of a cartridge with the backwards cutting edge bullet seated with the sealtite band touching the leade very close to the end of the freebore. Then, for example, if the freebore diameter is 0.226" and the diameter of the sealtite band is 0.2252" then you should measure an OAL around 1.6882". When I do this with my barrels I get an OAL of 1.6880" indicating that the diameter of the freebore is more like 2.2257" which is a bit bigger than the minimum diameter plus half the tolerance. This assumes that the lands are perfectly at 0.219" and all other dimensions are MINIMUM SPEC, which is highly unlikely.
     
    <*(((>< and Varminterror like this.
  7. Walkalong

    Walkalong Moderator Staff Member

    Joined:
    Nov 20, 2006
    Messages:
    59,974
    Location:
    Alabama
    No me. :D
     
    Demi-human likes this.
  8. <*(((><
    • Contributing Member

    <*(((>< Contributing Member

    Joined:
    Feb 1, 2013
    Messages:
    2,513
    Interested in this thread, as the Valkyrie has a lot of potential for long range in the ar15, just have read about too many issues in the past, sprinkled with some flurries of greatness.

    @carnaby how are the reports of your Valkyrie barrels doing? Was waiting for the teething pains to either remedy themselves or get worse on the Valkyrie to see if I want to jump in.

    My 6.8 SPC 20" barrel of yours is very nice.
     
  9. carnaby

    carnaby Member

    Joined:
    Feb 25, 2004
    Messages:
    1,375
    Location:
    Bellingham, WA
    I've got a post up from my recent range trip with the new Federal Gold Medal Match. Great stuff. Sierra modified the bullets and I was able to shoot hand loads and the new factory 90 SMK side by side. Impressed by both:

    http://www.bisonops.com/2019/04/20/new-federal-gold-medal-match-224-valkyrie-ammunition/

    That 24" barrel can't miss. On the other hand, I have another barrel, 22", that is a little less satisfying. That's how it is with production, or really any barrels, you'll always have some that are superb, some that are good, and some that don't measure up. With that new FGMM load, none of our barrels should shoot 5-shot groups worse than 1.5MOA consistently. I expect that most will shoot a lot better. As always, if anyone ever gets a clunker from Bison Armory, we'll get it sorted out.
     
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice