270 wsm velocities

Discussion in 'Reloading' started by fllefty, Nov 16, 2013.

  1. fllefty

    fllefty Well-Known Member

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    Dec 12, 2009
    Hi guys, I have a 270wsm rifle 24" barrel that I'm working up a load. Problem is that I'm having a problem matching book velocities (nosler manual). I have two different chronos and I'm getting pretty consistent velocities from both units. When I fire factory winchester 150gr CT silver tips I get the boxes printed vel. which is 3120fps. I'm using H4831sc and H1000 and 140 BT. With both loads I'm 1.5 to 2gr over max, the H4831sc comes in @3000fps the H1000 a little less. Anyone have any thoughts? Thx
     
  2. Salar600

    Salar600 Well-Known Member

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    Sep 16, 2012
    as you must know every barrel is different. But my T3 SS shoot the 130 and the 150 at expected vel but not the 140.

    Don't know why but might be your problem to. Try to reload the 130 and the 150 and you will seethe big picture.
     

  3. skyfish25

    skyfish25 Well-Known Member

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    Sep 28, 2010
    I couldn't get velocity I wanted from H4381. Had better with Mag Pro and best with RL-17. It also had the best accuracy with 130 gr SST. Load .006" from lands and that lowly Savage(beech stock, Simmons package scope) shoots 1/2 moa all day.
     
  4. CogburnR

    CogburnR Well-Known Member

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    Dec 18, 2010
    I believe it. I seldom get book velocity out of my 270WSM's.

    The Winchester ammo is probably loaded with Supreme 780 ball powder. You could try some of that to see if it will duplicate the factory load. Magpro or Magnum would also be contenders.

    Some of the factory stuff shows more pressure than I like to hunt with so my loads are more conservative.
     
  5. Salar600

    Salar600 Well-Known Member

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    Sep 16, 2012
    CogburnR is right on, I got the best vel and acc for the 130SST with W780, 150SST with H1000.
     
  6. lightflight

    lightflight Well-Known Member

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    Mar 29, 2012
    130 ttsx and with Reloader 19 gets me good accuracy and velocity as well as 130sst and IMR4350