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9mm ammo question

Discussion in 'Rifle Country' started by mio, Dec 2, 2008.

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  1. mio

    mio Member

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    i just bought a box of magtech 115gr full metal jackets. it lists muzzle velocity at 1135fps and energy at 330ftlbs from a 4in vented test barrel. how do i figure out what id get from a 16.5in barrel?
     
  2. Deer Hunter

    Deer Hunter Member

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    Chronograph.

    Past that, it's hard to tell. Loading a 9mm with slow burning powder and then using a 16.5" barrel (like from a pistol caliber carbine) can get some impressive results. I'm not sure how magtech loads their rounds, though.
     
  3. mio

    mio Member

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    dont suppose ther eis some type of formula to give me a rough idea? im just curious since ill be shooting it out of a hi point carbine.
     
  4. biggiesmalls

    biggiesmalls Member

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    couldn't you figure out the exceleration from 0 to when it leaves the barrel, and then assume it continues to accelerate at the same rate (which it should, because the time is too short for it to start losing energy and decelerate), and then figure out what the speed is when it leaves the longer barrel? i'm sure a physics major could do this in a few minutes. wish i had sat in more classrooms these past few years... lol
     
  5. stubbicatt

    stubbicatt Member

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    I get right at 1100 to 1130 fps out of my P7 with 115 grain bullets loaded over 5.5 grains of WSF. It is a stout load, but you can always shoot less powder if you wish.

    The only way to know is to chronograph your load.
     
  6. Walkalong

    Walkalong Moderator

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    Somewhere in the nieborhood of 1300 FPS or so from your 16" barrel, if it gets 1135 FPS from a real 4" barrel.

    A couple of loads that gave me 1167, 1146, & 1168 FPS from a TZ-75 with a 4 1/2" barrel gave me 1308, 1333, & 1351 FPS from my AR's 16" barrel.

    I have faster and slower loads, but those looked like they would match up close to your 4" barrel output.
     
  7. GRIZ22

    GRIZ22 Member

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    dont suppose ther eis some type of formula to give me a rough idea? im just curious since ill be shooting it out of a hi point carbine.

    That would be impossible to do. Variables such as fast vs slow powder, how tight or loose the bore is, conventional vs polygonal rifling, etc.

    I pick up 100-150 fps in my Hi point vs my Glock 17 with a wide variety of loads. Subsonics stay subsonic. Your results may vary but not by much.
     
  8. mio

    mio Member

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    thanks guys
     
  9. 357mag357

    357mag357 Member

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    This chart was copied from a post in the reloading section.
     

    Attached Files:

  10. lipadj46

    lipadj46 Member

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    @biggiesmalls

    Bullets stop accelerating the moment they leave the barrel. Well not exactly the acceleration is negative due to friction so they actually begin to lose velocity the moment they leave the barrel.
     
  11. mio

    mio Member

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    thx 357 dont suppose they have a ft lbs chart too?
     
  12. Wedge

    Wedge Member

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    Here is the energy formula.

    E = m • v^2 / (2 • 32.1739 • 7000)

    Just input the bullet weight in grains for m and velocity in ft/second for v and you'll get foot pound out.
     
  13. M1key

    M1key Member

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    Some data I have complied:

    Ruger PC9 Ballistics: from www.grimjaw.net/ballistics.htm
    Rem Golden Saber 124gr +p jhp 1397 1406 1414 1389 1409 1397 1416 1416 1414 1384 avg 1404.2 s.dev 11.736
    Speer Gold Dot 115gr jhp +p+ 1544 1643 1629 1653 1650 1641 1658 1652 1657 1620 avg 1634.7 s.dev 34.144
    Winchester Ranger 127gr jhp +p+ 1368 1400 1413 1382 1392 1411 1389 1390 1370 1388 avg 1390.3 s.dev 15.004
    Rem 115gr jhp +p+ 1577 1595 1568 1589 avg 1582.25
    Fiocchi 115gr fmj 1307 1395 1344 1389 1381 1380 1340 1384 1373 1405 avg 1369.8 s.dev 30.151
    Fed Premium Hydrashok 124gr jhp 1229 1307 1291 1319 1290 1308 1309 1287 1291 1299 avg 1293 s.dev 24.806
    To calculate energy: E = W(eight in grains) * V(elocity in fps) * (V(elocity in fps)/450450).
    JA
    **********************************************************************************************
    February 1st, 2007, 02:20 AM
    I have never shot any 40 carbines but I have chronographed 9mm and 45acp pistols/carbines. Both resulted in 150fps or less increase in velocity with factory loads in the carbines due to the fast burning rate powders used in factory ammo. Using the slowest medium buring rate powders I could find to make reloads resulted in a velocity increase of a maximum of 230fps. The limited case capasity and pressure limits of cartridges designed for semi auto pistols precludes the use of the slowest burning rate handgun powders that really show large increases in velocity in the longer barrels of carbines.
    Handloading 357 magnum cartridges really showed some amazing results due to being able to use the slowest burning rate handgun powders in the large volume of the 357 magnum cases. Depending on bullet weight the results were 400fps-800fps increases in velocity in a 18" barreled carbine versus a 6" barreled pistol.
    **********************************************************************************************
    From: FirearmsTactical.com
    9mm 147 grain Federal HydraShok JHP, 11/27/90 (Marlin M9):

    Test Gun Barrel Length Velocity Bare Gelatin Clothed Gelatin
    Penetration Expansion Penetration Expansion
    Marlin M9 16.5" 995 fps 21.35" 0.37" 15.60" 0.60"
    *********************************************************************************************
    From GlockTalk: Joe Mamma
    Temperature: 40 degrees F
    Ammo Description (Product Code) average velocity with G-17, average velocity with Kel-Tec Sub 2000
    Federal Hydrashok 124 gr +P+ JHP (P9HS3G1) 1167, 1321 fps
    Federal NATO, 124gr FMJ (M882)1114, 1231 fps
    Winchester USA Brand ("White Box") Hollow Points 115gr JHP (USA9JHP) 1149, 1305 fps
    Winchester USA Brand ("White Box") Hollow Points 147gr JHP (USA9JHP2) 1020, 1117 fps
    CCI Blazer Brass 115 gr FMJ (5200) 1120, 1299 fps
    Sellier & Bellot 115 gr FMJ (80166-00902) 1162, 1296 fps
    Geco/Dynamit Nobel 124gr (23364-12585) 1129, 1256 fps
    Magtech 147gr "FMC-FLAT" (891798-001347) 969, 1096 fps

    *********************************************************************************************
    From GlockTalk: WinstonSmith
    A friend of mine in Kentucky just did some chrono measurements on the Keltec Sub2000 and a Kahr PM9 with a 3" barrel. All measurements at 15 ft from muzzle and at 64 degrees F. Here are the results:
    Win 147 gr JHP - Five shots through the SUB-2000:
    1111 FPS
    1139 FPS
    1119 FPS
    1136 FPS
    1130 FPS

    1139 FPS - High
    1127 FPS - Average
    1111 FPS - Low
    28 Extreme Spread
    11 Standard Deviation

    Win 147 gr JHP - Five shots through the Kahr PM9:
    938 FPS
    923 FPS
    910 FPS
    934 FPS
    915 FPS

    938 FPS - High
    924 FPS - Average
    910 FPS - Low
    28 Extreme Spread
    11 Standard Deviation

    Maybe there is some intermediate barrel length that would do even better but the 16" barrel is clearly faster than the Kahr PM9 or Glock 17.
     
  14. rcmodel

    rcmodel Member in memoriam

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    Of course its faster.
    But not that much faster.

    Given enough barrel length, pistol ammo will reach a point of diminishing returns rather quickly.

    As noted, slow burning powder will give better results in a longer barrel.

    But it is impossible to know what powder the factories use, so it is impossible to predict it with any formula.

    rcmodel
     
  15. wnycollector

    wnycollector Member

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    I know that this is not 9mm but...using .40S&W magtech 155gr JHP's I get ~1175fps from my CZ40B and ~1350fps from my Keltec sub2000.
     
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