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Underwood 357 Sig 125gr at 1511 fps!!!

Discussion in 'Caliber Corner' started by Police Marksman, Oct 15, 2012.

  1. Police Marksman

    Police Marksman

    May 28, 2006
    Take a look at the improved Underwood 357 Sig 125gr. Gold Dot ammo at 1511 fps out of a Glock 32!!

    [ame=""].357 SIG Underwood 125 gr Gold Dot Ammo Test (SIM-TEST) - YouTube[/ame]
  2. Travelin' Jack

    Travelin' Jack Misinformed

    Jul 20, 2007
    0 .· ` ' / ·. 200
    I've been waiting on this review. Currently carrying Golden Sabres in 357 Sig. I've been wanting to switch to the Underwood GD load if it performed well or to the HST if it didn't. Looks like Underwood it is.

  3. ABNAK


    Apr 22, 2005
    Yes!!! I have two boxes of this "improved" stuff waiting to be shot.

    > 1500fps is mindboggling! That is what the 357Sig should be loaded to.

    For those folks that speculated that those velocities would be above the Gold Dot's window for integrity, well, guess not.

    Me likey!
  4. WiskyT

    WiskyT Malcontent

    Jun 12, 2002
    North Carolina
    Lot's of muzzle flash and a chrono at 10 feet is not conducive to accurate results.
  5. unit1069


    Oct 10, 2007
    So. Central US
    Bottom line for me is this: The 100 fps higher velocity in the Underwood only provided a half inch more penetration than the Gold Dot, with approximately the same expansion. If I recall correctly tnoutdoors' test of the 125-grain Golden Saber Bonded yielded 16" penetration with .59" expansion and the 125-grain HST came in at 14.50" penetration with about the same expansion. tn said there was more recoil with Underwood, as should be expected.

    If I didn't already have a good supply of "Big Four" .357sig self-defense JHP ammo I'd most likely pick up some Underwood, especially at the current price point competitive with the rounds I already have. It was good to see the Gold Dot bullet fare well at the 1500+ velocity with the energy well into the mid-600 ft lbs. Underwood seems to be doing all the right things with its high-velocity ammo.

    Update: After reviewing tnoutdoors' videos the 125-grain HST penetrated 13.25" with .592" expansion and the 125-grain Golden Saber Bonded penetrated 16" with .579" expansion. Both ammos delivered 1" - 1.5" wide stretch cavities of six to seven inches in length.
    Last edited: Oct 15, 2012
  6. CourtCop

    CourtCop Millennium Member

    Feb 21, 1999
    Brodheadsville, PA
    After seeing that video I ordered a .357 Sig barrel for my S&W M&P 40 just for the fun of it.

    Outdoor Hub mobile, the outdoor information engine
  7. avenues165


    Jun 15, 2012
    SLC, Utah
    I am very impressed with the ability of the GD bullet to handle the jacked up velocity.

    Now to get some for the G24. What, maybe 1,650fps from the 6"?

    I was very disappointed to see the chronos a few weeks back of UW 357 sig coming in at ~1,350fps. It is great to see they are running this at the velocities that the 357 sig was meant to achieve. I would have been thrilled with 1,450fps.

    A cup and core JHP at those velocities would be very interesting:whistling:
  8. cowboy1964


    Sep 4, 2009
    I don't see the advantage over regular Speer Gold Dot or HST or Golden Saber Bonded. Just more recoil. I also prefer nickle cases, if possible.
    Last edited: Oct 15, 2012
  9. unit1069


    Oct 10, 2007
    So. Central US
    Right. According to tn's test the Speer 125-grain Gold Dot produced 14.50" penetration and .567" expansion whereas the Underwood 125-grain Gold Dot gave 15" penetration and .560" expansion.

    I do wonder if there's a practical application for Underwood's high energy for woods carry or against hard barriers. I don't know enough about those areas to know if it would provide a clear advantage.
  10. ABNAK


    Apr 22, 2005




    Federal Classic

    *maybe* Hornady

    The .357 Magnum wasn't bonded; far from it with a SJHP.
  11. dkf


    Aug 6, 2010
    I was thinking that penetration would have come in less than it did with possibly a grain or two or shed weight. I was also expecting a larger damage path as well vs some of the other slower rounds. I do not get to hung up on final expansion diameter, I am more interested in the damage path and adequate penetration. The round no doubt put more energy into the target. I may pick up a box or two sometime to test out however I doubt I will stray from the HST and GS Bonded.

    After seeing essentially the same 6 petal design in .357mag and now the .357sig higher velocities. I am thinking the same design in .401" would work well for the 10mm at higher velocities. The current .40 GDs in that application tend to achieve meteorite status.
  12. NEOH212

    NEOH212 Diesel Girl

    Mar 25, 2008
    North East Ohio
    Now that's more like it. Providing the cases aren't showing signs of over pressure, and providing it stays consistent, this load may finally set the .357 Sig out in front of the rest.

    Time will tell but is sure looks like they finally have something here with this loading!

  13. Glock19Fan

    Glock19Fan Cool Guy

    Mar 25, 2003
    This is some very impressive velocities and energies.

    However, going along with the some of the above posters, I dont think that this round showed much advantage in terms of permanant cavity compared to other .357SIG loads, and even compared to other common service calibers (9mm, .40, .45ACP).

    I am not a .357SIG fan (9mm guy), but I will admit this is very impressive. And like someone mentioned above, a non bonded cup and core bullet would definately be interesting. In fact, I think that a light fragmenting bullet in this bullet weight and velocity would be very effective, despite being a handgun cartridge.

    I think Underwood has pushed the .357SIG in ways that give the .357 magnum a real run for the money, and capacity.
  14. Scoob


    Sep 10, 2002
    That is impressive. Is it me or does the OAL look noticeably longer than the factory GD in the video? That could partly explain how Underwood was able to hot rod it to this extent.
  15. PghJim


    Apr 21, 2005
    You are right if energy does not matter to you. I happen to think it does.
  16. ABNAK


    Apr 22, 2005

    Use the right bullet and you'd see a difference. Cup-and-core.....