Case Overall Length (COL) Variance

Oct 30th, 2016

If you are experiencing a greater than normal variance in your Case Overall Length (COL) you may want to check your projectiles for variances in the ogive.  It is likely that most of the variation you are seeing is caused by variations in the ogive of the projectile.  To test:

  • pull the clip off the seat die, push out the cross pin and remove the bullet seating stem.
  • Hold a projectile up into the stem, and measure from the base of the projectile to the top of the bullet seating stem.
  • Measure 50 or so, and see what the extreme spread is.  
For testing we measured 100 traditional 9mm 115gr fmj rn projectiles, from a well-known manufacturer, and found .026" total variation. 
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