Making 300 Blackout Brass From 5.56 Brass

MG1890

January 10, 2014 07:42

How difficult? Anybody actually doing it? Which die set?

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  D@D

  January 10, 2014 08:01

  Have you seen this video? You might be able to make one.
  
  https://www.youtube.com/watch?v=LAGxcKI6XDc

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  charliemeyer007

  January 10, 2014 08:10

  http://www.youtube.com/watch?v=jSLhwECrVnI
  
  I be happier if he tightened the locking nut on the sizing die de-capping stem.

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  Mobuck

  January 10, 2014 08:39

  Considering the cost of good .223 brass and the effort & tooling to do it right, I figure the cost of buying ready made well worthwhile. I could crank out some 300AAC with what I have sitting on my reloading bench(and I may use that venue to repurpose some over trimmed 223 cases) but the semi-commercially made brass is more consistent.

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  clays

  January 10, 2014 10:30

  quote:Originally posted by MG1890
  How difficult? Anybody actually doing it? Which die set?
  
  Yes, I purchased a jig off E-bay that fits the Harbor Freight mini cut off saw. With a little tweaking, got it to cut them to a perfect length. I then use a Lee case length cutter mounted in a drill to insure all are the same length. Run them thru the die and they are ready to load. I prepared 500 cases in about 2 hours and have now loaned my cut off rig to several different people wanting to do the same.

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  62fuelie

  January 10, 2014 10:41

  Just speculating, I'm sure someone can set me straight, I would think that when you cut that much off the length of the case you are going to need to anneal before you form the case and outside turn the necks for proper thickness to get uniform chambering.

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  Mobuck

  January 11, 2014 02:19

  "Just speculating, I'm sure someone can set me straight, I would think that when you cut that much off the length of the case you are going to need to anneal before you form the case and outside turn the necks for proper thickness to get uniform chambering."
  
  That would be the difference between "doing it" and doing it right.

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  dfletcher

  January 11, 2014 17:32

  quote:Originally posted by Mobuck
  "Just speculating, I'm sure someone can set me straight, I would think that when you cut that much off the length of the case you are going to need to anneal before you form the case and outside turn the necks for proper thickness to get uniform chambering."
  
  That would be the difference between "doing it" and doing it right.
  
  
  
  
  I can't speak to making them but I reload for 3 or 4 AAC rifles. I've noticed with cutdown brass the case neck thickness of the end product varies a fair amount. I can feel a distinct difference when seating - some case neck fits are tight as heck, others allow the bullet to slip in nice & easy. One of my rifles is a heavy barreled Remington 700, I'm leaning toward using "original" brass when shooting for accuracy.

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