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Observations about longer barrel, etc.

Discussion in '10mm Reloading Forum' started by jeffreybehr, Jul 7, 2010.

  1. jeffreybehr

    jeffreybehr Silver Member

    765
    3
    Mar 14, 2009
    Phoenix, AZ USA
    1. The 5.15" LW barrel makes more of a velocity difference than I thought it would. With 4 different identical loads, velocities are almost 100FPS higher.

    2. This LW 5.15" barrel is also the most-accurate I've had in any of my Glocks. For instance, today's 20 5-shot groups averaged 3/10-inch smaller than the essentially same loads shot over the weekend thru the original barrel.

    3. After a little preliminary velocity measuring Tuesday nite, the groups I shot today were strings with lower charges of Longshot and A7 and 4 loads of A9 creeping up to what I thought I wanted. Turns out 3 loads--1 with A7 and 2 with A9--of the 9 loads I shot had too-HIGH velocity for my desires for a 155g. PD load. Some may, but I don't need a PD load generating 10' velocites over 1375FPS, but it's sure a nice problem to have. :embarassed:

    4. Based on ONE batch of 18 groups from 9 different loads, so far the loads with A9 are generating the smallest groups, but that's only by a tenth of an inch at 10 yards.

    I sure am liking this.

    [​IMG]
     
    Last edited: Jul 8, 2010
  2. Maine1

    Maine1

    1,338
    16
    Jul 20, 2007
    Maine
    i like your rig. Have been really tempted to get a 5.15 barrel, too.

    I was just on the longslide forum, thinking it would be a good idea to cook up a 20L

    I MAY just get a blacked LW slide, as it has the bullnose i like, and get a blacked and blind marked 5.15 barrel, giving me a mini-long slide, sans some of the weight.
    Of course, money is the only thing stopping me..
     

  3. _The_Shadow

    _The_Shadow Ret. Fireman

    4,522
    22
    Jul 23, 2007
    Southeast, LoUiSiAna
    Yes the longer barrels allow the expanding powder gases to give a little more push for a little long resulting in the high velocities you are seeing.

    LooK at the site for actual test done...http://www.ballisticsbytheinch.com/10mm.html
     
  4. ctkelly

    ctkelly

    36
    0
    May 9, 2010
    I think what the OP meant was he was surprised by the increase in velocity from a barrel that is just .55" over the factory length. 100 FPS increase just from a half inch longer barrel is pretty impressive.
     
  5. jeffreybehr

    jeffreybehr Silver Member

    765
    3
    Mar 14, 2009
    Phoenix, AZ USA
    Indeed.

    (My 1st attempt at a response was 'Yup!', but that was too short for the system to accept.)
     
  6. MSgt Dotson

    MSgt Dotson

    3,268
    9
    Sep 30, 2006
    The LWD barrel also has a tighter chamber, allowing less pressure to be 'wasted' expanding/fireforming the case to swell in the factory barrel...

    I see 50 fps greater velocity with a 5.3" Lone Wolf barrel (980 fps) over a 5.3" Glock (930 fps) factory bbl, chroning each with the same .40 handload two minutes apart...
     
  7. Cam Cooke

    Cam Cooke

    209
    0
    Dec 5, 2003
    I have a 5" KKM barrel in my G20 and a 4.25" Storm Lake barrel in my G29 I was very surprised at the velocity gains that I saw from my loads.
     
  8. cwb

    cwb

    570
    0
    May 24, 2010
    I have a stock barrel and a LW 6" barrel and I have never seen more than a 60 FPS difference. It usually ranges from 40 to 55 FPS.