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9mm 115 vs 124 in IDPA

Discussion in 'General Competition' started by YamaLink, Mar 15, 2010.

  1. YamaLink

    YamaLink

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    Apologies in advance if this should be in reloading and not the competition forum.

    I'm shooting a Glock 34 in IDPA and will be trying IPSC. I am about to place a bulk order and was wondering about 115g vs 124g.

    I'm using Accurate #2 with CCI primers. I'm a newbie, so I ask: is the 115 not going to cut it? They don't chrono for my local fun matches but I'd like to practice with what will work all the way through the most strict of events.
     
  2. Hoser

    Hoser Ninja

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    I like 124s a lot more than 115s as the recoil is just a touch softer and the front sight isnt moving so fast I cant track it.
     

  3. DustyDawg48

    DustyDawg48

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    With both IDPA and IPSC you'll have to meet the minimum power floor/factor which is really close to the same in both sports. I think IDPA is 125,000 (bullet weight multiplied by velocity) and a similar formula in IPSC. You'll either have a much faster and lighter bullet or a slightly slower and slightly heavier bullet. I don't think 9 grains would make that big of a difference; maybe if you were talking 115 vs 147 but 115 vs 124 I don't know if there is really an issue unless your gun might feed one better than the other.
     
  4. 9mmXRAY

    9mmXRAY IDPA MW2 GSSF

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    I use WWB factory 115gr FMJ's I have not once after thousands of rounds ever had a single failure... your just starting to reload so your going to have multiple failures on the clock until you get it right... no matter what your going to be scored Minor power factors for either of those 2 bullets.
     
  5. DustyDawg48

    DustyDawg48

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    99mmXRAY, good point about scored Minor on the 9mm. I had forgotten about that.
     
  6. 9mmXRAY

    9mmXRAY IDPA MW2 GSSF

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    I had heard about somebody getting scored major in 9mm... you heard this? Is that like +P+ ammo or some kinda hopped up reload??
     
  7. DustyDawg48

    DustyDawg48

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    Your guess would be as good as mine on that; I'll be the first to admit that I'm not up on all my IPSC/USPSA goings on. I figured 9mm getting the penalty was because it was a smaller bullet. I have never shot IPSC, but would like to eventually, so I haven't researched it as much as I've tried to research and understand IDPA.
     
  8. Jon_R

    Jon_R

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    To get major in USPSA you have to hit 165 Power Factor. Gernerally people trying to shoot major 9 load it themselves and usually only done in an open gun designed for it and they are probably running 147 Grain bullet. One of the reasons for it is the cost and availability of .38 super brass which is / was the standard for Open guns for a long time.

    115 Gr would have to be going 1434FPS to make major.
    147 Gr would have to be going 1122FPS to make major.
     
  9. ron59

    ron59 Bustin Caps

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    1) The OP asked about IDPA, there is no "major" there.
    2) As stated 115/124 isn't much difference. That's why I run a 147gr over Solo 1000. SUPER SOFT (less recoil). I loaded up a magazine with alternating WWB 115gr, and my reloads, and shot them the other day. Monster difference with the SAME power factor. I don't "game" and try to load down, my 147gr are loaded to an EASY 130PF. Yet the recoil (and even the sound of the blast) is night and day difference. It costs me more to load the 147gr Montana Golds, but I love 'em.

    ??? As stated, with IDPA there is no "getting scored Minor".
    ??? Multiple failures on the clock? I just started reloading last June, and have never had a "failure", on or off the clock. I wouldn't recommend taking the first 10 rounds you load straight to the match, but work the load up, get it to power factor, take a few hundred to the range and you should be good to go.

    NOTE: Early on, I was loading a little light, and had some rounds that didn't fully cycle the gun all the way... I got that taken care of pretty quick. I'll confess to trying to "game" a little, but when I realized
    1) light load can cause a "jam" from not cycling (not a squib, just didn't fully eject spent round)
    2) That slow flying 147gr bullet wasn't very accurate

    I got my load up to power factor and I'm good to go.

    But to answer your question, OP... the 115 will more than "cut it".

    To compute power factor, it's simply bullet weight times velocity.
    130PF for a 147gr bullet (130,000 / 147 = 884 fps. Mine avg at 890 I believe)
    130Pf for a 124gr: 1048fps
    130pf for a 115gr: 1130fps

    I have a couple of threads where I did some chronos:
    http://glocktalk.com/forums/showthread.php?t=1157726
    Talks about my 147gr load, but I also chrono'ed some WWB to insure my numbers were ballpark accurate. I was getting WWB 115gr to have 1149fps. That's above 130pf, and the requirement is only 125pf.
    Here's a guy who chrono'ed WWB 115gr and saw 1152fps.... pretty close to what I saw, eh?
    http://www.thehighroad.org/showthread.php?p=6339979


    http://glocktalk.com/forums/showthread.php?t=1165565
    shows my most recent tests with my 147gr stuff.
     
    Last edited: Mar 15, 2010
  10. Hoser

    Hoser Ninja

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    In USPSA, not IDPA, there is such a thing as Major 9. It is legal only in Open and Revo. No other divisions.

    Major 9 isnt hard to reload either. Use a 124 or 130, slow & dense powder and seat it longer than factory 9x19.
     
  11. robin303

    robin303 Helicopter Nut

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    I just got back from GT Distbutors with a hoard of 124. The last match with 115 took a while to knock down the steel targets.
     
  12. YamaLink

    YamaLink

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    Thank you. I'll go at it with 124.
     
  13. 9x45

    9x45 Millennium Member

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    You should not have any issues with either bullet weight. The 9mm was developed based on the 115gr. If steel doesn't fall with a center mass hit then ask for a calibration. You were either shooting it too low, and it was set too far forward. In IDPA, they have to use the longest barreled gun in division, so a G34 is used to calibrate, even if you are shooting a G26. I run 115's on top of 4.0grs of TiteGroup at 1.165 OAL. It goes about 1,150fps out of a G17, easily makes the minor floor.
     
    Last edited: Mar 15, 2010
  14. ronin.45

    ronin.45

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    You won't notice any real difference between the two weights. Buy whichever is cheapest in bulk.
     
  15. jhayesvw

    jhayesvw

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    i run 125 grain lead bullets
    i push them to 1050fps with 4.3grains of HP38, but it smokes alot.
     
  16. 9mmXRAY

    9mmXRAY IDPA MW2 GSSF

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    I know there isnt any major/minor scoring in IDPA other than making the min 125pf... me and dusty went on a tangent... lol

    Thanks guys for letting me know what was up with the 165pf 9mm major in USPSA... was one of those questions I forgot to ask until I saw this post really.
     
  17. ck1

    ck1 Some Dude

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    If you're going to roll your own I say neither... 147gr's are the way to go. You'll make PF with a softer shooting load and at least IMO 147's always feel best.
     
  18. 1stSSPZ

    1stSSPZ

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    Once that damn buzzer goes off, I couldn't tell you WTH I was shooting......!
     
  19. dsmw5142

    dsmw5142 NRA Member

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    I use both, but my favorite are 147gr and/or 130gr Moly's from BBI.
     
  20. 9x45

    9x45 Millennium Member

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    There is major in IDPA, but it only applies to CDP (.45acp) and ESR revolver, the same value as USPSA, 165,000. IDPA does it by gun division.