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Remington 223 Brass Weight Variation

I recently weighed 153 pieces of once-fired Remington 223 brass that had all been full-length resized, trimmed to length, deburred, primer pockets uniformed, and neck turned.  Here is the resulting data:

  • Average = 90.8 grains
  • Standard Deviation = 0.71 grains
  • Average Deviation = 0.53 grains (average of the absolute deviations of the data points from the mean … 0.53gr actually isn’t that bad)
  • Variance = 0.51
  • Extreme Spread = 4.0 grains
  • Extreme Spread as % of total weight = 4% (this is significant)

Remington 223 Brass Weight Distribution

All data was gathered using a RCBS ChargeMaster 1500 Powder Scale, which is accurate to +- 1/10 grain and was calibrated immediately prior to use.

For match grade ammo, I only use brass that is within 1% of each other in terms of weight.  In this example 0.9 grains is roughly equivalent to 1% of the total weight (90.8/100 = 0.908).  So for this distribution, I gathered all pieces that weighed between 90.2 and 91.1 and called them my “match brass”.  I culled the brass on the extreme ends and will use them to setup my neck turning equipment, but probably won’t ever load them.  I split the remaining brass into two groups: under 90.2 and over 91.1.  It will be loaded for practice rounds or “foulers” … just not for matches.

I’ve found a very useful method to sort brass as you are weighing it.  I use a plastic eggcrate louver (typically used to diffuse light and protect flourescent bulbs in commercial applications).  I bought it from Lowes for a few dollars, and it works like a champ.  I just put all of the brass that weighs the same (to 1/10 of the grain) in the same column.  An added benefit is it pretty much makes a physical distribution chart for you when you are done.

For more info on weighing brass, check out this helpful blog post from Sinclair.

About Cal

Cal Zant is the shooter/author behind PrecisionRifleBlog.com. Cal is a life-long learner, and loves to help others get into this sport he's so passionate about. His engineering background, unique data-driven approach, and ability to present technical and complex information in a unbiased and straight-forward fashion has quickly caught the attention of the industry. For more info on Cal, check out PrecisionRifleBlog.com/About.

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