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40S&W Major Power Factor loads 170 grain LSWC, Missouri Bullet

Discussion in 'Handloading and Reloading' started by lexjj, Jun 21, 2012.

  1. lexjj

    lexjj Well-Known Member

    I seem to have found a black hole in my 4 reloading manuals.

    I have about a thousand 170 grain LSWC from MBC. I can't find any data on that weight of bullet in Lyman, Hornady, Hodgdon, or Sierra manuals.

    I've got 231, Auto Comp, Titegroup, VV N320, and Bullseye.

    I'm trying to get the rounds firing at roughly 1000 fps in order to make major power factor for USPSA. Anyone got any ideas?
    Last edited: Jun 21, 2012
  2. kludge

    kludge Well-Known Member

  3. steve4102

    steve4102 Well-Known Member

    Use Lyman 175gr data.
    I think you may have to try a slower powder if you want to push that 170gr lead bullet past 1000fps.
  4. res7s

    res7s Well-Known Member

    Hodgdon has AutoComp 180gr XTP data. Try the starting load and run it thought the lights. It should break 1000fps or be very close to it.

    I'd also suggest trying AA#7.
  5. lexjj

    lexjj Well-Known Member

    Thank you gentlemen. I used the Lyman data for 175 last night to load up some test rounds, but the more I look around the net, the less good I feel about them.

    I'll look into Number 7. The loads are for an xD 5.25"
  6. beatledog7

    beatledog7 Well-Known Member

    165gr or 175 grain lead data would be within 3%. Your scale can barely measure that much difference for typical .40S&W loads.

    Lee 2nd has W231 data for 170gr lead bullet ranging from 4.0gr reaching 827fps to 5.2gr reaching 1030fps.
    Last edited: Jun 21, 2012
  7. bds

    bds Well-Known Member

    Attached Files:

  8. Crashbox

    Crashbox Well-Known Member

    I use a 180-grain with 7.5 grains of Longshot to replicate SD recoil/bang in the .40- there should be a suitable load for the 170-grain pill you're shooting. I believe 8.0 grains is the max for a 180, and it moves over 1000 FPS IIRC. Longshot is ideal IMO for the .40, high velocities and reasonable pressures.

    Hodgdon's website may (or may not) be helpful.
    Last edited: Jun 22, 2012
  9. ArchAngelCD

    ArchAngelCD Well-Known Member

    I'f you're going to load lead bullets you just have to buy the Lyman Cast Handbook 4th edition. It is THE load manual for lead bullets!!! It's not a copy of the data in Lyman's 49th Edition handbook, it has additional data from molds other than those made by Lyman. (that's a first!)
  10. lexjj

    lexjj Well-Known Member

    Thanks for the help. I shoot a lot of lead, so I will keep an eye out for that other Lyman manual.
  11. squarles67

    squarles67 Well-Known Member

    These were shot out of an M&P fullsize with the same MB bullet and WSP primers
    8.4g of AA#7 gave me 1023
    5.6g of HP-38 gave me 1060 (beware as this is over max listed above)
    6.5g of Power Pistol gave me 1057

    I liked the #7 load the best, YMMV

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