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gain of longer barrels?

Discussion in 'The 10 Ring' started by M1A Shooter, Aug 12, 2012.

  1. i know that a longer barrel usually gains velocity and power but does anyone have any data on specific loads in a standard glock 20 vs a 20L?

    i currently own a glock 17, 26, and 35. looking to buy a 20 soon, possibly. looking to either go threaded barrel and a carver comp, or a 6" lone wolf upper but am curious about the gain.

    my uses will be primarily a woods gun with the probablility of handgun hunting whitetails in TN.

    thanks ahead of time.

  2. nickE10mm

    nickE10mm F.S.F.O.S.

    Apr 13, 2004
    Wichita, KS
    There will be lots of replies here, I'm sure.... be sure and check out my 10mm hunting thread .... its a stickied thread in this forum.
  3. 10 fan

    10 fan 10 fan

    Nov 20, 2011
    Lake McClure,CA
    I have cnrono'd several factory loads in my 2 G20 and 2 G29's but don't have a LS.:cool:
  4. _The_Shadow

    _The_Shadow Ret. Fireman

    Jul 23, 2007
    Southeast, LoUiSiAna
  5. Brian Lee

    Brian Lee Drop those nuts

    Jul 28, 2008
    Up a tree.

    I do happen to have that data.

    This was all recorded mostly in strings of 50 or more shots, so the averages I'll give here are from a pretty good sample. I used a Pro Chrono Digital, outdoors. The barrels were the stock G20 barrel, and the Genuine Glock brand 6" Hunting barrel, so it's even the identical rifling in each. It's the same ammo from the same boxes, on the same trip to the range in each case. 17 pounds is the stock recoil spring weight, but I was using a Heavy Tungsten Rod in all cases. The long barrel was used with the stock G20 slide.


    Federal American Eagle 180 Grain FMJ - Practice Ammo
    17lb recoil spring was used.
    Short Barrel Average = 1065 FPS
    Long Barrel Average = 1112 FPS

    CCI Blazer Aluminum Case 200 Grain FMJ - Practice Ammo
    17lb recoil spring was used.
    Short Barrel Average = 1017
    Long Barrel Average = 1082

    Double Tap 155 Grain Barnes XPB Solid Copper - SD Ammo
    17lb recoil spring was used.
    Short Barrel Average = 1117
    Long Barrel Average = 1200

    Double Tap 165 Grain Golden Saber Hollow Point - SD Ammo
    19lb recoil spring was used.
    Short Barrel Average = 1297
    Long Barrel Average = 1323
  6. VN350X10


    Apr 13, 2001
    McHenry, IL
    I seem to remember some data compiled using 10" & 14" barrels on a T.C.Contender, and the 14" showed no advantage. The 10MM case doesn't have enough volume to require the longer barrel, in fact, the 10" recorded higher velocities than did the 14" with several loads, & when the 14" did show higher velocities, it was by a negligable amount.
    This is why my 10MM Contender barrel is a 10".

    uncle albert
  7. CanyonMan

    CanyonMan In The Saddle

    Jul 26, 2002

    I agree U. Albert !

    The G20 on average between stock length and 6" is about 40/50fps usually. I have never seen any need for the 6". The stock lenght OEM drops deer at 100yds fine. Excellent accuacy, and velocity. Just have not seen enough vel increase in 6" to warrant getting one. I tried the 6" OEM, and the LW 6" some years back... Went back nto all stock length, and all stock barrels as well.

    All has been well ever since ! ;)

    Good hearing from you amigo.

    I was going to call you the other night, after going through some VV powder load notes you gave me a while back. I may do that yet.

    Stay safe Pard.

  8. VN350X10


    Apr 13, 2001
    McHenry, IL
    any questions, give a hollar Pard !

  9. bac1023


    Sep 26, 2004
    I'm thinking its more the quick burning powders used than the capacity of the case.
  10. VN350X10


    Apr 13, 2001
    McHenry, IL
    Probably a combination of powder burn rates, expansion ratio & lack of case volume.
    Even thou a 10MM originally operated around 40+K psi, powders that work great in a .44 Mag don't preform that great in a 10MM. Good example, 2400 is kind of lame in a 10MM.

    uncle albert