Twist rate for 220gr Sierra Matchking in 300 RUM

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Alucard, Mar 15, 2005.

  1. Alucard

    Alucard Well-Known Member

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    Hello, this will be my first post /ubbthreads/images/graemlins/smile.gif I have a Remington 700P in 300 RUM, with a 26" heavy barrel, 1 in 10 twist. Will the 220 gr. Sierra matchking stablize properly with this twist rate? I get consistant 1/2" 5 shot groups at 100 yards with the bullet, but 1" to 1.5" groups at 200 yards. Just wondering if the bullet is not stabalizing properly. Thanks for the info.
     
  2. Guest

    Guest Guest

    Your 1 in 10 twist is fine for the 220 SMK. I shoot the 240 SMK out of my 29" barrel and it's also a 1 in 10 twist. Sometimes a good load at 100yds won't necessarily shoot as well at longer range.
    Wayne
     

  3. Alucard

    Alucard Well-Known Member

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    Thanks Wayne for the advice. I will try a different load at 200 yards and see how it works at 100. Should I speed the velocity up? Or bring it back down? I use a charge of 89.5 gr of Retumbo with a Fed Gold Match Large Rifle Mag primer.
     
  4. BountyHunter

    BountyHunter Writers Guild

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    Try the 200 SMK. It is widely known as the most accurate/most uniform bullet sierra makes for 30 cals.

    BH
     
  5. Alucard

    Alucard Well-Known Member

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    Ok, thanks. I was thinking of trying the 200 gr MK to see how they work. If a load shoots good at 200 yards, should it also shoot good at 100 yards? Thanks.
     
  6. 3sixbits

    3sixbits Well-Known Member

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    [ QUOTE ]
    Hello, this will be my first post /ubbthreads/images/graemlins/smile.gif I have a Remington 700P in 300 RUM, with a 26" heavy barrel, 1 in 10 twist. Will the 220 gr. Sierra matchking stablize properly with this twist rate? I get consistant 1/2" 5 shot groups at 100 yards with the bullet, but 1" to 1.5" groups at 200 yards. Just wondering if the bullet is not stabalizing properly. Thanks for the info.

    [/ QUOTE ] With groups like that, how can you even ask? /ubbthreads/images/graemlins/tongue.gif
     
  7. Alucard

    Alucard Well-Known Member

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    I am not all that familiar with "Great" groupings at 200 yards plus. 1.5" groups at 200 yards doesn't "appear" all that great on paper. Forgive my ignorance, but what is the minimum group size to be considered "great" at 200 yards - I am quite new to the sport of long range shooting /ubbthreads/images/graemlins/tongue.gif
     
  8. 3sixbits

    3sixbits Well-Known Member

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    [ QUOTE ]
    I am not all that familiar with "Great" groupings at 200 yards plus. 1.5" groups at 200 yards doesn't "appear" all that great on paper. Forgive my ignorance, but what is the minimum group size to be considered "great" at 200 yards - I am quite new to the sport of long range shooting /ubbthreads/images/graemlins/tongue.gif

    [/ QUOTE ] Any stock rifle that will shoot into 1.5" @ 200 yards is doing vary well indeed! Only on the internet do we read of better from an off the shelf rifle!
     
  9. Alucard

    Alucard Well-Known Member

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    And here I was thinking that my rifle had a problem! /ubbthreads/images/graemlins/smile.gif The only work that I have had done is the action bedded with Marine-Tex, and a trigger adjustment - we all know how bad Remingtons factory triggers are /ubbthreads/images/graemlins/frown.gif I use a Ken Ferrall 20 MOA base - also bedded with Marine-Tex - with a Elite 3200 10x Tactical scope and Burris Signature series rings.

    Thanks for all the great info guys!!
     
  10. 3sixbits

    3sixbits Well-Known Member

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    Man I wish I could shoot that well at 200 yards with a 10x scope. But time has not treated my eyes that kindly. When I test anything anymore I screw on a 36X scope to find out what the load and rig is capable of. If I can't see my bullet holes, then I can't steer! /ubbthreads/images/graemlins/wink.gif
     
  11. Brent

    Brent Well-Known Member

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    My suggestion is to try the 200 gr. Accubond at 90 gr. Retumbo and work up. My best load. These shoot very well in the Ultra's and better than the Sierra's in mine. I've yet to try the 240 SMK, but it will stabilize in the 10 twist 700 bbl.
     
  12. Alucard

    Alucard Well-Known Member

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    Thanks for the tip Brent. I was thinking of trying out the 200 gr SMK. I have had good luck with all of sierras bullets so far.

    3sixbits:
    Yes, I also prefer the larger magnification. But unfortunately, I don't have have any higher magnification scopes that will take the 300 RUMs poundings /ubbthreads/images/graemlins/crazy.gif
     
  13. dbhostler

    dbhostler Well-Known Member

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    Anyone know what the bc for the AccuBond bullet is. Shoot them past 800 yds?
    db
     
  14. Brent

    Brent Well-Known Member

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    Temp 33 deg F, BP 29.38, Station Pressure (SP) 29.32, 50ft ASL.

    MV and PSI was tested with the Oehler M43, and downrange MV was over the Oehler M35P.


    200gr Accubond, H50BMG, 210M, OAL 3.765", on lands.

    Charge, MV (@11 ft), PSI, Downrange MV (298 yards), BC (Calculated from velocity lost)


    100gr = 3236 @ 68,900 --- Sighter off to the side
    100gr = 3197 @ 66,000 --- 2658 --- .559

    102gr = 3259 @ 68,600 --- Wind blew the shot 3" off, no reading.
    102gr = 3276 @ 70,900 --- 2741 --- .575

    104gr = 3317 @ 73,500 --- 2782 --- .581
    104gr = 3335 @ 75,800 --- 2796 --- .579


    210gr JLK, Retumbo, 210M, OAL 3.828", .005" into lands.

    90gr = 3170 @ 69,600 --- Sighter off to the side.
    90gr = 3173 @ 69,600 --- 2719 --- .660
    90gr = 3155 @ 68,900 --- wind again
    90gr = 3165 @ 69,600 --- love that wind, had to hold off to keep them over the chrono now.
    90gr = 3146 @ 67,600 --- 2708 --- .680
    90gr = 3151 @ 68,000 --- 2702 --- .663
    90gr = 3155 @ 68,600 --- 2705 --- .663
    90gr = 3157 @ 67,600 --- 2708 --- .664

    BC is corrected to standard conditions at sea level.