MP340 vs LCR9 vs P365 vs G19x

Discussion in 'General Firearms Forum' started by -JCN-, Aug 22, 2018.

  1. -JCN-

    -JCN-

    Messages:
    5,428
    Likes Received:
    19,535
    Joined:
    Jan 31, 2017
    135gr Speer Gold Dot short barrel 357 magnum vs. 135gr Federal +P Tactical Bonded 9mm out of snubby revolvers and micro semi-auto with a 4” compact thrown in for reference.

    Left to right: MP340, LCR9, P365, G19x
    B85E9EB0-1CB4-4E91-B649-EB4797F18240.jpeg

    357 Magnum
    374225BB-2F3E-47F4-90E1-942894AB46F0.jpeg

    Peak dB at shooter ear 170.2
    530BB366-945B-4B8A-8DF6-299970A5A358.jpeg

    The 9mm +P Federal is slower out of the LCR9, but much quieter and softer shooting.
    C47ECDA1-4FFE-43BE-8723-17ADEF5AB715.jpeg 88F0D6EE-D2A8-4D31-A83E-46F855FC6873.jpeg
    161.5dB instead of 170... it’s a noticeable difference.

    Velocities with the P365 were almost identical to the LCR9.
    F9129D3D-78BA-44FB-92A6-66D3752C1455.jpeg

    Just a whiff louder, but within measurement error at 163.4dB. C23F265A-E505-4BA7-9DB3-551FF685EDAF.jpeg

    What barrel length would bring the 135gr +P 9mm to the short barrel 357 magnum velocities?

    With a 4” barrel, the 9mm was faster.
    297F2427-A854-426C-AD78-AFAE08224167.jpeg

    I’d guess that velocities out of a G26 or G43 would be similar to the short barrel 357 magnum.

    Conclusion: for commercial 357 magnum out of a snub, it’s about subcompact 9mm power, both in this current 135gr and the previous 124gr test.

    Sure, you could load hotter 357 magnum... but the 9mm revolver is quieter and more easily shootable.

    I think I would take that trade off. I’m still favoring the LCR9 over the MP340 loaded with 357 magnum.

    Of note: the 135gr +P 9mm Federal didn’t fully expand out of the revolver, but it did out of the P365 (at similar velocities), so there’s something destabilizing potentially with that combination.

    Left to right: P365 (12”), G19x (12.5”), 2 shots from the MP340 (14”, 14.5”), 2 shots from LCR9 not fully expanded (15.5”, 15.75”),

    302DB62A-7292-4E00-A2FB-F2F236CF0BB0.jpeg

    286405F3-B18F-4B79-90A2-1BAA120CDD5F.jpeg

    Please “like” if you found this informative!
     
    Last edited: Aug 23, 2018
  2. powernoodle

    powernoodle

    Messages:
    8,845
    Likes Received:
    25,764
    Joined:
    Jan 24, 2002
    Location:
    secret underground bunker
    Good stuff. Looks like a fun outing.

    I be loving me some P365 today. My current favorite carry gun. But I love your J-frame and LCR9 too.

    I appreciate your conclusion, and it seems pretty much spot on.

    [​IMG]

    [​IMG]
    Fits in a Glock 42 pocket holster.

    [​IMG]
    A 5" 686 Plus would crank a little more velocity out of the .357, but its hard on the squishy bits to carry it all day.
     
    Last edited: Aug 22, 2018
    tic-tok-GLOCK, pittpa and -JCN- like this.

  3. pittpa

    pittpa What did I come in here for?

    Messages:
    10,704
    Likes Received:
    22,395
    Joined:
    Jan 24, 2010
    Location:
    Fortress of Solitude on 11th floor - SW PA 'burbs
    Good posting. Your chrono validates my own testing of Speer SB 357out of my 340 PD where it averaged 1026 fps, just 1 fps less than you got-amazing.
    I tested UW 124g GDHP +P out of the LCR9 and it averaged 1138 fps, for 357# energy. That is 41 more # than the Speer SB(edit-357 mag from my 340PD), but it is easier to shoot due to the added weight of the LCR9.
    The 124g GDHP was shown to perform well at this velocity in the AmmoQuest testing on Youtube.
     
    Last edited: Aug 22, 2018
    -JCN- likes this.
  4. jr24

    jr24

    Messages:
    6,791
    Likes Received:
    9,859
    Joined:
    May 3, 2014
    Location:
    WI
    Fantastic stuff, thank you for it!

    I am of the opinion is you have to get to around 3" to make the .357 mag "worth it" in terms of noise and recoil over the 9mm with most commercial loadings.

    The does seem to support that theory, at least with this test.
     
    -JCN- likes this.
  5. Jerry52

    Jerry52

    Messages:
    173
    Likes Received:
    199
    Joined:
    Apr 2, 2002
    Location:
    Over by there
    But if find the MP340 the best for carry,
     
    -JCN- likes this.
  6. pittpa

    pittpa What did I come in here for?

    Messages:
    10,704
    Likes Received:
    22,395
    Joined:
    Jan 24, 2010
    Location:
    Fortress of Solitude on 11th floor - SW PA 'burbs
    Gratuitous L-frame revolver posting. Reported. :cheers:
     
    -JCN- likes this.
  7. fnfalman

    fnfalman Chicks Dig It

    Messages:
    65,111
    Likes Received:
    27,018
    Joined:
    Oct 23, 2000
    Location:
    Tejas, US
    That chronograph is pretty cool.
     
    TeaDub and -JCN- like this.
  8. ithaca_deerslayer

    ithaca_deerslayer

    Messages:
    32,741
    Likes Received:
    29,716
    Joined:
    Jul 11, 2000
    Location:
    Upstate NY, USA
    Wonder if 158gr .357 mag bullets are louder or quieter.
     
    -JCN- likes this.
  9. Truth&Balance

    Truth&Balance

    Messages:
    3,034
    Likes Received:
    2,569
    Joined:
    Feb 4, 2015
    Location:
    USA
    Well done, thanks for testing and sharing the results. Very informative.
     
    -JCN- likes this.
  10. G26-Has-my-6

    G26-Has-my-6 Fullclip's Life Matters! FLM!!

    Messages:
    8,582
    Likes Received:
    19,479
    Joined:
    Nov 29, 2017
    Location:
    Twin Cities, MN
    Thanks for taking the time to do this. I always look forward to an infamous -JCN- ballistics presentation. You should consider starting a youtube channel and pick up where tnoutdoors9 left off.
     
    -JCN- and tic-tok-GLOCK like this.
  11. bac1023

    bac1023

    Messages:
    125,097
    Likes Received:
    27,007
    Joined:
    Sep 26, 2004
    Location:
    PA
    Very nice report

    Thanks for sharing
     
    -JCN- likes this.
  12. TeaDub

    TeaDub

    Messages:
    4,873
    Likes Received:
    8,739
    Joined:
    Feb 9, 2014
    Location:
    OTP Atlanta
    One hundred and seventy decibels out of the 357? Holy ringing ears Batman. :alex:

    Another cool test JCN. Thanks for the time and effort you put in. :thumbsup:
     
    -JCN- likes this.
  13. jr24

    jr24

    Messages:
    6,791
    Likes Received:
    9,859
    Joined:
    May 3, 2014
    Location:
    WI
    I would love to see what the decibel level is at the shooters ear between say a 19 and 19C.

    I know the C is louder, but I've yet to find any measurements to see by how much.
     
    -JCN- likes this.
  14. arkdweller22

    arkdweller22 Cuhootnified Roamer

    Messages:
    9,831
    Likes Received:
    18,836
    Joined:
    Dec 26, 2008
    Location:
    North America
    Nice work and a great report @-JCN-.
    Cheers to you! :cheers:
     
    -JCN- likes this.
  15. michpatriot

    michpatriot

    Messages:
    170
    Likes Received:
    62
    Joined:
    Feb 1, 2010
    Would you consider shooting a round of 180gr 357 out of that 340? I've shot some out of my MP340 and would love to see the noise level..another tester with a LCR357 got 1240-1260 fps using the Buffalo Bore 357 180gr outdoorsman. My quick math shows that would equate to 620ft lbs or so,but the lab radar for a 340 would be stellar to see! They really kick, but no crimp jump. Man o man do they knock the steel target around! It's amazing really, compared to the 357 Gold Dot 135 gr. It's night and day on the target as far as power.
     
    -JCN-, jr24 and Out West like this.
  16. jr24

    jr24

    Messages:
    6,791
    Likes Received:
    9,859
    Joined:
    May 3, 2014
    Location:
    WI
    That would be impressive out of a snub for sure.
     
    -JCN- likes this.
  17. -JCN-

    -JCN-

    Messages:
    5,428
    Likes Received:
    19,535
    Joined:
    Jan 31, 2017
    If anyone has requests or wants to send me any particular ammo to sound test, I can do that. My next "curiosity" sound tests might include:
    • 22WMR vs 22LR out of a NAA Mini
    • Kriss vector +/- suppressor (right sided ejection, makes for a great suppressor host... no gas to face).
    • 300 blk pistol +/- suppressor
    • RDB-survival rifle at the ear....
    I have an N-frame 2" Smith 327PC that would be great to test hot 357 magnum out of snub length barrel. But unfortunately even with the cylinder gap turned down to nothing (adjustable like a Dan Wesson), it still puts out lower velocities than my J-frame snubs.
     
    c10bonanza likes this.
  18. pittpa

    pittpa What did I come in here for?

    Messages:
    10,704
    Likes Received:
    22,395
    Joined:
    Jan 24, 2010
    Location:
    Fortress of Solitude on 11th floor - SW PA 'burbs
    Just for one magic moment. :cheers:
     
    TeaDub and -JCN- like this.