300WSM, Barnes 180TTSX, Reloader 17

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Ronster, Jan 19, 2009.

  1. Ronster

    Ronster Member

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    I would like a good starting point for grains of powder (reloader 17) for a 300wsm shooting a 180TTSX Barnes bullet. Alliant shows thier recommendations of 66 gr for a 180SPBT speer, that is the closest info I can find to the Barnes TTSX.

    On a side note, the OAL for my browning is 2.900 (with a .030 reduction recommended by barnes), however, my magazine will not hold over 2.855, what are your recommendations?

    Thanks
    Ron
     
    Last edited: Jan 19, 2009
  2. Ronster

    Ronster Member

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    Bump for any info. Thanks in advance for your help.
     

  3. MontanaRifleman

    MontanaRifleman Well-Known Member

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    I think you're charting new waters.

    I would start with 61 grains, work one grain at a time to 64, then a half grain up to max.

    Am very interested to hear your results.

    Cheers,

    Mark
     
  4. Ronster

    Ronster Member

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    Great, at -20 outside it might be a bit before I dedicate some time at the range. I will let you know how it turns out once it warms up.
     
  5. Ronster

    Ronster Member

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    Today I loaded up some 300wsm rounds. I used Reloader 17 for the Barnes 180gr TTSX and Reloader 15 for the 168gr TTSX. For the reloader 17 loads I started at 62 gr and worked up to 67, for the reloader 15 rounds I started at 53 and ended at 59.

    I bought a new chrony today so as soon as I get some warmer weather I will be trying this out. Chrony batteries and my fingers dont last long at the -20 range.

    Ron
     
  6. 7mm Eclipse

    7mm Eclipse Well-Known Member

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    My gunsmith recommended that I seat the Barnes TTSX bullets .050 off the lands in my 7mm WSM. This modification did more to tighten my groups that anything else I tried. Groups with the all copper bullet were in the > 1" category at settings of .020" and below. Setting the TTSX jump to .050" resulted in < 0.40 MOA. Maybe more jump may help with your 300 WSM.

    This modification to your reloading could get you a bit lower than your 2.855" length clip restriction.

    Mike