Podcast 34 Ballistics

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3 Types

Internal; Time the trigger is pulled until the bullet exits the barrel

  • Lock Time
  • Dwell Time
  • Barrel Harmonics
  • Forcing Cone or Throat
  • Bullet Jump
  • Twist Rate
  • Pressure Curves
  • Powder Burn Rates
  • Lock Time

**** I mentioned the chamber pressure for an M4 a couple times as 25,000 PSI and the SAAMI spec is actually 52,000 PSI.  Thanks to the listener  for pointing that out.  I should have looked it up instead of going off of my faulty memory. ****

External; The acre the bullet takes in flight

  • Bullets Fall at 9.8m/s2
  • Sights or Line of Sight is designed to intersect the bullets path
  • Bullet appear to fall faster as it moves slower
  • Ballistic Coefficient

Terminal; What the bullet does when it hits something

  • Normally what people are concerned with
  • FBI Test (see an outline here)
    • Penetrate 12-18 Inches
    • Ballistic Gel Blocks 6×16”
    • 6 Events 5 rounds each (total 40)
      • Bare
      • Heavy Clothing
      • Steel
      • Wallboard
      • Plywood
      • Auto Glass
      • Heavy Clothing at 20 Yards
      • Auto Glass at 20 yards
    • 2 Different guns, “1 service weapon and 1 test barrel”
    • 2 10-shot Groups fired from each for measurement
  • Target Shooting Doesn’t matter much
  • Self Defense Most trauma possible to create as fast a stop as possible
  • Bullet weight retention is always mentioned
  • Permanente Wound Channel
  • Temporary Stretch Cavity
  • The Strasbourg Tests
    • Conclusion “…Because of the high probability of rib impact, a single handgun bullet cannot be counted on to immediately incapacitate an individual.  Multiple rounds should be fired.”
  • 3 Times is the magic number

Stay Safe,

Ben

 

 

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