Factory load chrono numbers for the .300 RUM

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Tang, Nov 13, 2009.

  1. Tang

    Tang Well-Known Member

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    How many of you have run factory ammo out of your .300 RUM's across a chrono ?

    My reloading stuff hasn't arrived, so I havent gotten to start loading for my Sendero yet. A friend gave me a few older (6+ years old) Remington 180gr loads for it, so I could shoot it a few times. Not sure if it was the cloudy day or not, but it only showed an average of 3180. Does that sound about right ?
     
  2. Akhutr

    Akhutr Member

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    That sound a little slow in a 26" barrel.
    The only factory load I've chronoed in the 200 grain nosler partition load.
    26" barrel, ohler 35, 3154 fps avg.
     

  3. J E Custom

    J E Custom Well-Known Member

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    That sounds about right .

    The SAAMI spec for the 180gr load is 3250 @ 65,000 psi .

    A re loader can get a little more but it will exceed the SAAMI pressures.

    This is in a test barrel and they are typically a little faster than a factory barrel.

    J E CUSTOM
     
  4. D.Camilleri

    D.Camilleri Well-Known Member

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    I bought a box of factory remington 180 core lock ultra's for my 300 when I first built it so that I could shoot it. They cronoed at about 3350 but only shot about a 1.5 inch group. 3250 shoots much better out of my barrel, although now that I have changed powder from rl 22 to h 1000 my velocity is up to about 3325 with very good accuracy.
     
  5. MontanaRifleman

    MontanaRifleman Well-Known Member

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    A box of Rem 180 Scirroco's, power level III came with my Sendero from the original owner. They chrono'd @ 3356 ave for 6 shots in good daylight.

    Mark
     
  6. Tang

    Tang Well-Known Member

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    The chrono was a Chrony F1, and it was very cloudy, so we didnt put the screens on it. It was my first time using a chrono, so that could have contributed to it. The general result seems to be 3300+ from factory ammo from all the people I have asked today.

    How far away from the muzzle should the chrono be, and how high above the chrono should you be shooting ?
     
  7. Long Time Long Ranger

    Long Time Long Ranger Well-Known Member

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    I chronographed the first run of factory bullets back in 1998 or so. They were remington 180 grain nosler partitions. Averaged 3334 fps for 5 shots out of a 28" 1-10 twist custom Hart barrel. Very consistent and very accurate.
     
  8. MontanaRifleman

    MontanaRifleman Well-Known Member

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    I put my chrony 15' away and put the bullet about 6"-10" above the lenzes.