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Old April 8, 2014, 10:11 PM   #1
Join Date: December 18, 2013
Location: Deep Woods of East Texas
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Future 300 Blackouts

I have a few dozen .204 shells and I wont be loading these. Can I neck them up to the 300 Blackout size like the .223's?
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Old April 8, 2014, 11:44 PM   #2
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Old April 11, 2014, 11:38 AM   #3
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You can use 204 brass just fine but you don't actually neck them up to make 300BLK. You cut the brass off near the shoulder and neck them down to form the neck. I've made 250 pieces so and have had great luck.

Here is the forum for the 300 BLK:

Also, search for youtube videos on making the brass. Lots of good info out there.

I'm having a fantastic time with mine!
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