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Why fast powder for light loads?

Discussion in 'Reloading' started by d123gaw, May 29, 2014.

  1. d123gaw

    d123gaw

    196
    6
    Aug 28, 2012
    Not in KY anymore
    Can someone please explain why faster powders are desired for lighter recoil, slower loads? (I'm working on some .40 target loads)

    I understand slow powders having more burn time in high power loads but I can't wrap my mind around the fast powder slow load thing.
     
    Last edited: May 29, 2014
  2. WeeWilly

    WeeWilly

    3,477
    335
    Nov 12, 2011
    PRK
    Fast powders allow you to keep pressures up while producing lower velocities. Lower velocity means less recoil. Pressures up near max mean cleaner more consistent burn.
     


  3. fredj338

    fredj338

    21,682
    909
    Dec 22, 2004
    so.cal.
    ^^^This^^^
    All powders need a certain pressure level to burn completely. If you are trying to get low vel loads, a faster powder reaches efficient burn more easily.
     
    Last edited: May 29, 2014
  4. happie2shoot

    happie2shoot

    2,667
    548
    Jan 5, 2008
    Some do it because it's cheaper, uses less powder.

    In the 454 I use 8gr for light and 26gr to 39gr for heavy.
     
  5. creophus

    creophus Born Again

    1,031
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    Mar 18, 2005
    Florida
    Also, to that point, the amount of powder in the case, also goes out the barrel along with the projectile contributing to recoil.

    All things being equal, less powder will also mean less recoil.
     
  6. d123gaw

    d123gaw

    196
    6
    Aug 28, 2012
    Not in KY anymore
    Good deal.
    I've been playing with some 3.5ish grain bulls eye loads behind a 165gr berry and I like what I'm seeing.
    Thanks again!
     
  7. Steel Head

    Steel Head Tactical Cat

    16,067
    30,959
    Jan 1, 2010
    A cat box in WA
    Nailed it!

    I like WST for my 40 target loads.
     
  8. ChrisJn

    ChrisJn "Old Bill"

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    Dec 30, 2008
    Baldwin Co, Alabama
  9. poodleplumber

    poodleplumber

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    Apr 23, 2009
    I'll be danged. I wouldn't have believed that without the video.
     
  10. attrapereves

    attrapereves

    2,099
    0
    Sep 11, 2011
    Midwest
    You can use a slower powder at lower velocities, but it's best to find a powder that will be loaded near max for the velocity you are seeking.

    I used AA#5 for 230gr 45ACP for a while, but as I was only wanting velocities to match factory ammo (800-850fps), I was getting a lot of unburned powder and soot. I switched to a faster powder that I could load near max and it cleared right up.
     
  11. breacher1

    breacher1

    354
    2
    Apr 13, 2009
    I dropped down to 4.5 gr of Power Pistol with a 40 cal 180 gr Berrys plated and it was very soft and accurate. It barely runs my G35 with a 14 lb recoil spring. The cases were pretty sooty after. I figured if I can't find any faster powder for light loads I should at least use heavy bullets to keep the pressure up a bit.
     
  12. fredj338

    fredj338

    21,682
    909
    Dec 22, 2004
    so.cal.
    Yeah, PP would not be my choice for 40 minor loads, too much blast & will not burn as clean as running it over midrange. For all medium burners, run them well above midrange levels for best results.
     
  13. breacher1

    breacher1

    354
    2
    Apr 13, 2009
    Exactly. Seems like all the powder I've been able to find the last few months has been on the slow end of the scale. I have one lb. of Win. WST set aside for the NRA PPC Nats in Sept, love that stuff. Wish I could find more.
     
  14. fredj338

    fredj338

    21,682
    909
    Dec 22, 2004
    so.cal.
    Ha, you & me both! I have about 4# left, saving it for sanctioned idpa matches. I have broken out some 15yr old powders to make practice ammo. Hopefully things get better after the nov elections.:crying:
     
    Last edited: May 31, 2014