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What velocities are you getting out of Federal XM193 in 18" SPR-like barrel?

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  • Jicko
    Calguns Addict
    • Dec 2005
    • 8774

    What velocities are you getting out of Federal XM193 in 18" SPR-like barrel?

    I am interested in knowing what velocities are you getting out of Federal XM193 in a 18" SPR-like barrel?

    I am reading a 5-round avg close to 3330fps, I thought that it is only suppose to go at around 3250fps(+/- 40fps) out of a 20" barrel (chrono @ 15ft). So, I want to make sure that my Shooting Chrony Alpha Master is giving me "accurate" readings. Chrono'ing @ 6ft in a warm day, 90deg.
    Last edited by Jicko; 07-10-2007, 4:19 PM. Reason: Adding M193 spec #s.
    - LL
    NRA Certified Firearm Instructor
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  • #2
    Prc329
    Calguns Addict
    • Oct 2006
    • 5603

    If I can get to the range this weekend I'll try it and see.
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    • #3
      ar15barrels
      I need a LIFE!!
      • Jan 2006
      • 56983

      Originally posted by Jicko
      I am interested in knowing what velocities are you getting out of Federal XM193 in a 18" SPR-like barrel?

      I am reading a 5-round avg close to 3330fps, I thought that it is only suppose to go at around 3200fps out a 20" barrel. So, I want to make sure that my Shooting Chrony Alpha Master is giving me "accurate" readings. Chrono'ing @ 6ft in a warm day, 90deg.
      Standard published velocities are tested at 70 degrees.
      You can expect an increase in pressure/velocity with higher temperatures.

      High quality stainless barrels are often faster than chromoly barrels due to the difference in rifling designs.

      Velocity is a good thing.
      Randall Rausch

      AR work: www.ar15barrels.com
      Bolt actions: www.700barrels.com
      Foreign Semi Autos: www.akbarrels.com
      Barrel, sight and trigger work on most pistols and shotguns.
      Most work performed while-you-wait.

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      • #4
        PIRATE14
        Veteran Member
        • Dec 2005
        • 3189

        Originally posted by Jicko
        I am interested in knowing what velocities are you getting out of Federal XM193 in a 18" SPR-like barrel?

        I am reading a 5-round avg close to 3330fps, I thought that it is only suppose to go at around 3250fps(+/- 40fps) out of a 20" barrel (chrono @ 15ft). So, I want to make sure that my Shooting Chrony Alpha Master is giving me "accurate" readings. Chrono'ing @ 6ft in a warm day, 90deg.
        Well you're half the distance 6FT instead of 15FT and you're 20plus degrees hotter......sounds pretty close........
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        • #5
          Jicko
          Calguns Addict
          • Dec 2005
          • 8774

          I just want to use the XM193 as a "control experiment" during my Mk262-R&D-clone process.

          I was getting some inconsistent velocities after tweaking of my reloading equipment, so I just want to weed out the issue of a "erroreous chronograph".

          I used to get 2714fps(3 rounds avg) from 24.5gr of RL15, but after I "fixed" my die issues, I am now getting 2801fps(10 rounds avg) from 24.5gr of RL15.

          According to Nosler's website 24.5gr of RL15 yields about 2741fps (most likely from LONG barrels tho).

          Back then, my XM193(same lot) gives an avg vel of 3185fps; but now, they are flying @ 3330fps!!!
          Last edited by Jicko; 07-10-2007, 4:31 PM.
          - LL
          NRA Certified Firearm Instructor
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          • #6
            Prc329
            Calguns Addict
            • Oct 2006
            • 5603

            I measured 10 feet from the muzzle give our take a few inches from a 1-9 16" barrel (forgot to bring the SPR) and I was getting 3200fps from XM193, 2600+ from American eagle and about 3200 from wolf gold 75g.
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            • #7
              donger
              Senior Member
              • Oct 2005
              • 1560

              Originally posted by Prc329
              about 3200 from wolf gold 75g.
              Was that a typo? 3200 for a 75 grainer sounds really hot.
              Certified Ragaholic

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              • #8
                Prc329
                Calguns Addict
                • Oct 2006
                • 5603

                yeah that was I checked my notes and it was 2600. That was an xm193 number I got mixed up.
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