close

Privacy guaranteed - Your email is not shared with anyone.

Do Glocks benefit from longer bullets?

Discussion in 'Reloading' started by MinervaDoe, Aug 23, 2011.

  1. MinervaDoe

    MinervaDoe

    9,806
    2,194
    Jan 26, 2009
    San Jose, CA
    I'm just reflecting on a conversation I once had with a fellow shooter. He felt that since Glocks have a high rate of twist in their barrel, that they benefit from firing bullets that are longer. Do you guys think there is any truth to this? :cool:
     
  2. freakshow10mm

    freakshow10mm 10mm Advocate

    Glocks have a pretty standard rate of twist for the given cartridge.
     

  3. Police10-42

    Police10-42 505

    164
    0
    Jan 17, 2011
    North Carolina
    longer bullet= more drag, you would have to use a lighter load to keep pressure down which would have a lower fps.
     
  4. Boxerglocker

    Boxerglocker Jacks #1 Fan

    6,202
    42
    Mar 6, 2003
    Lynnwood, WA
    Are you talking longer bullets as in OAL or longer bullet as in the projectile only?
     
  5. fredj338

    fredj338

    22,644
    1,437
    Dec 22, 2004
    so.cal.
    Discussing twist rate implies longer/heavier bullets. At least that is how I read it.
    Sure, but again, at handgun vel, you aren't getting any advantage in using long/heavy for caliber bullets going slow, unless you are trying to make low recoiling rounds that still have good accuracy.
     
  6. MinervaDoe

    MinervaDoe

    9,806
    2,194
    Jan 26, 2009
    San Jose, CA
    So, Glocks actually have a fairly standard rate of twist?
    I guess I'm operating with some false information. That's why I asked.
    Probably just longer & heavier. But, on the theoretical side, I believe that the pure copper bullets are much longer then lead based bullets of the same weight.


    Are the heavier bullets lower recoiling simply because you use less powder?
     
    Last edited: Aug 24, 2011
  7. fredj338

    fredj338

    22,644
    1,437
    Dec 22, 2004
    so.cal.
    True, lighter wt copper bullets will always be longer than lead core bullets of sim wt.
    The lower recoil thing is a matter of getting the heavier bullet to a low enough vel. The heavier bullet gives enough mass to function the slide & as long as vel is kept to that min, recoil is less. A lighter bullet needs higher vel to achieve the same inertia for the slide. At equal vel, the heavier bullet always has more recoil than the lighter bullet. Can't mess with physics.
     
    Last edited: Aug 24, 2011
  8. freakshow10mm

    freakshow10mm 10mm Advocate

    Yes, like the .45 ACP is an industry standard 1 in 16 inch twist, I think that's the same for the .40 and 10mm, the 9mm might be 1 in 18 inch twist. A factory barrel is going to be able to handle the spectrum of standard bullet lengths (read: weights). So a Glock .45 ACP will have sufficient rate of twist to accurately shoot bullets from 165gr to 230gr, as that's the most common range of factory ammunition.
     
  9. DWARREN123

    DWARREN123 Grumpy Old Guy Silver Member

    7,445
    1,499
    Jan 25, 2008
    Clarksville, Tn.
    I believe Glocks are more accurate with bullets that have a longer bearing surface due to the rifling type it has.
     
  10. MinervaDoe

    MinervaDoe

    9,806
    2,194
    Jan 26, 2009
    San Jose, CA
    Okay, so you've also heard that Glocks are more accurate with longer bullets, and you attribute this to the Polygonal rifling.
    Interesting.
    Thanks for the input.
    My quest for knowledge continues, and I have to wonder how the Polygonal rifling benefits from the longer bearing surface.


    http://en.wikipedia.org/wiki/Polygonal_rifling
     
  11. I always heard glocks were not accurate because they were made of plastic - it didn't matter what bullet was used.
     
    Last edited: Aug 24, 2011
  12. Zombie Steve

    Zombie Steve Decap Pin Killa

    18,083
    19
    May 31, 2007
    Old Colorado City
    This is correct. I read it in multiple places.






























    (I wrote it down and then I read it, but I believe everything I read). :whistling:
     
  13. DWARREN123

    DWARREN123 Grumpy Old Guy Silver Member

    7,445
    1,499
    Jan 25, 2008
    Clarksville, Tn.
    The longer bullets usually mean more weight but mine seem to be more accurate with longer bearing surface area bullets or heavier however you wish to state it. This experience comes from thousands of reloaded rounds. This is in 40 S&W and 10mm.
    Others may have different experiences.
     
  14. dkf

    dkf

    5,472
    150
    Aug 6, 2010
    Yeah but you can take them through a metal detector without setting it off.:rofl:
     
  15. MinervaDoe

    MinervaDoe

    9,806
    2,194
    Jan 26, 2009
    San Jose, CA
    I believe that there is something to it. Last year, I loaded up 2,000 rounds of 147 grain 9mm and these bullets definitely grouped nearly two inches higher. So, this week, I'm going to see how some heavier Raniers behave in my 10mm with about .5 grain less powder than my 155 grains. i.e. with both weight bullets, I am coaxing the slowest rounds that I can get to cycle the slide.
    If it kicks less, that will be a bonus. :supergrin:
     
    Last edited: Aug 24, 2011
  16. fredj338

    fredj338

    22,644
    1,437
    Dec 22, 2004
    so.cal.
    I think this is generally true of all bullets/barrels if the twist is proper. A longer bullet is just going to stabalize better than a shorter bullet. Again, for most shooters @ most handgun distance, you just won't see the diff.:dunno: