168 vs 208gr in 300 WSM

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by dk17hmr, Jul 18, 2010.

  1. dk17hmr

    dk17hmr Well-Known Member

    Messages:
    158
    Joined:
    Nov 15, 2009
    Im having a problem getting any group I can proudly say I shot with my 300 wsm and 208gr A-Max, I cant seem to get speed out of them and they are staying in about 3/4 MOA right now, however with 168gr A-Max running at book max I am getting desent speed and 1/4MOA groups. I know the 168s are going to slow down quicker than the 208s and therefor lack the knock down power at extended ranges. But for 1000 yards shooting or possibly longer on paper am I going to notice a difference?

    I really want to use the 208s because I like the bullet but the 168's are grouping alot better. I dont know what to do.

    My rig
    [​IMG]
     
  2. chris matthews

    chris matthews Well-Known Member

    Messages:
    838
    Joined:
    May 14, 2001
    There isn't any reason why you shouldn't be able to get the 208 to shoot better...sounds like you just need to do a bit more "tuning" with it. It will definitely out perforn the 168 at distances past 800.
     

  3. sniperjwt

    sniperjwt Well-Known Member

    Messages:
    825
    Joined:
    Dec 27, 2009
    i know what you mean dk17hmr. I am also shooting the (300wsm) 168s (SMKs) and are shooting them superb. .3" at 100, <3"at 550, and 11"-15" at 1012 in a pretty much stock gun. I however have not tried to shoot the 208s but i have some and im not sure if i should try with the way the 168s are shooting.
     
  4. ATH

    ATH Well-Known Member

    Messages:
    840
    Joined:
    Oct 7, 2003
    Depending on the setup of the gun you may not have enough case capacity to get the most out of the 208s. You could try 200s or 180s, either will outshoot the 168s ballistically.

    168s are okay for paper at 1000, the 308 guys do it with less velocity. You're going to be light for game though.
     
  5. ICANHITHIMMAN

    ICANHITHIMMAN Well-Known Member

    Messages:
    4,380
    Joined:
    Jan 31, 2008
    Just one question at what range are you testing at?
     
  6. dk17hmr

    dk17hmr Well-Known Member

    Messages:
    158
    Joined:
    Nov 15, 2009
    I am grouping mainly at 300 yards. I generally test loads at 225 yards. I guess I should test at 500-600 yards and just see.

    The rifle has a Krieger 1:10 twist only 24" long tube, seems to shoot slow with heavier bullets. The 208's were only going about 2650fps where the groups were tightest.

    I am neck turning and uniforming the flash hole. Although it is not a tight neck gun it did improve grouping.

    I can seat the 208's out to 3.090" and be just shy of the lands.
     
  7. ICANHITHIMMAN

    ICANHITHIMMAN Well-Known Member

    Messages:
    4,380
    Joined:
    Jan 31, 2008
    did you try switching primers?
     
  8. dk17hmr

    dk17hmr Well-Known Member

    Messages:
    158
    Joined:
    Nov 15, 2009
    Went from Winchester Large Rifle to Remington 9 1/2's, groups didnt change much.

    I have heard that 178gr A-Max would be better, but looking at the BC of the 2 bullets there isnt much of a difference.....not like the 208.

    I think it is obvious that I need to build a rifle for shooting the 208. :D
     
  9. justgoto

    justgoto Well-Known Member

    Messages:
    637
    Joined:
    Apr 11, 2009
    Why are you not using magnum primers? My Hornady manual suggests magnum primers.
     
  10. FEENIX

    FEENIX Well-Known Member

    Messages:
    9,806
    Joined:
    Dec 20, 2008
    I wondered about that too!
     
  11. dk17hmr

    dk17hmr Well-Known Member

    Messages:
    158
    Joined:
    Nov 15, 2009
    Not using magnum primers because nothing else I shoot requires magnum primers......didnt see the need to have more stuff on my shelf. I am not using ball powders so is there really a need for them?

    How much would magnum primers change things?
     
  12. justgoto

    justgoto Well-Known Member

    Messages:
    637
    Joined:
    Apr 11, 2009
    By your own admission, this rifle does "require" them. That is a lot of powder to ignite before your bullet reaches the end of that, (relatively short,) 24" tube.


    As soon as I saw your primer choice, I knew all of your questions had been answered.

    Paint me weird but, more primers on my shelf is a wonderful thing! I'd buy the correct primers, then give them a try over a chronograph.
     
  13. justgoto

    justgoto Well-Known Member

    Messages:
    637
    Joined:
    Apr 11, 2009
    But be sure to start your powder charge low and work your way up slowly.
     
  14. FEENIX

    FEENIX Well-Known Member

    Messages:
    9,806
    Joined:
    Dec 20, 2008
    I agree with Justgoto's recommendations! Different types and brands of primers affect the pressure generated by the cartridge. Changing from standard to magnum primers may substantially raise the maximum average pressure of the cartridge - a change that might be required to obtain your reloading goal (even though you are not using a ball powder).

    Good luck and keep us posted!