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Old April 23, 2011, 08:36 PM   #1
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.204 Rugar Brass

I just got my first .204. Can anyone tell me if they have formed cases, using223 brass! Thanks
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Old April 23, 2011, 09:15 PM   #2
Brian Pfleuger
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You would lose a large amount of case capacity compared to real .204 cases and your final case may not be long enough, being that it starts out about .090 shorter than a .204.

Real .204 brass is easily available. The loss of case capacity would practically neuter the round. You might as well have bought a .223 if you do that.
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Old April 23, 2011, 09:25 PM   #3
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When the 204 came out, brass was scarce, so we fire formed the parent case: 222 Rem. Mag. Squeeze the neck down to hold a .20 bullet, set the shoulder to a jam fit in your chamber, and viola. But now, why not buy the real thing.
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Old April 23, 2011, 10:12 PM   #4
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it is made from the 222 Rem Mag hull

Si vis pacem, para bellum

Last edited by Jim243; April 23, 2011 at 10:20 PM.
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Old April 28, 2011, 12:02 AM   #5
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The 204 Ruger does not use the .223 as the parent case, it's case is from the 222 mag.

20 Pratical= .223 case sized down
20 Tactical= .223 case sized down

I recently had a quest to get a 20 cal gun and wanted the 20 Pratical, I gave up when nobody around here had a reamer or had ever done one. I now have a 204 Ruger AR-15. It shoots as good as any factory bolt gun I have if not better.

I have used Hornady, R-P, and Winchester Brass. They charge 23-25 for 50 Hornady cases, and 25-30 for 100 R-P or Winchester cases. The loads worked in the Hornady and R-P,and Winchester are able to work in each other.

R-10X and N-140 for the 32 Grain V-Max
R-10X for the 39 Sierra and 40 V-max.

I used the Dan Newberry Method. Optimal Charge Weight

I settled on a "Mild" load, I have shot some brass 3-4 times, and never had to trim for length yet.
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Old April 28, 2011, 07:07 AM   #6
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Best place to buy brass is normally Powder Valley. They are currently out of Win which does pretty well. Price listed at $23.45/100. Some 204 guys go with Norma or Nosler if they are looking for ultimate accuracy, but lots more money. I like the Win brass and don't have any problem getting excellent accuracy with it. It holds up well to mutliple loadings especially if you anneal about every 3 or 4th firing. No split necks so far with some cases having over 10 loadings.
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Old April 28, 2011, 07:20 AM   #7
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Purchase 3 boxes of Hornady vmax 32gr or 40gr, bingo, brass.

Worked for me plus I had a standard to go by as I worked up loads for the 204. The vmax gave me .375 groups at 100 yards tough standards to beat.
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