300 Blackout

Discussion in 'The Ammo & Reloading Forum' started by jdon72, Mar 25, 2012.

  1. jdon72

    jdon72 New Member

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    Any one have some good info on loading this new round? I am looking at the 110gr, 130 gr, and 220gr.

    Thanks.

    J
  2. The_Vigilante

    The_Vigilante New Member

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    Location:
    El Paso, Texas
    I just got a 300 Blackout rifle also and will be following this thread. I did learn from another forum that it's advisable to use either Remington or CCI small rifle primers as they have a harder cup and won't be pierced by the AR-15 firing pin.
  3. jdon72

    jdon72 New Member

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    Interesting....I always use cci and the rem is recommended. In the ar15, cci has no problem. Just an FYI to your response that it seems to be correct.

    I just got in my h110 and am going to try imr4227 for subsonic and see where that goes. I heard that the accurate does not burn all the way in shorter barrels...that is why I am trying the 4227.
  4. gary0529

    gary0529 Member

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    Location:
    Northwestern Va.
    I have been reloading for the 300 Whisiper/aka Blackout for about 4 or so years - all subsonic with heavy, ie, 220 and 240 gr. Stopped using H 110 as it has a tendency to overpressure when the temps rise, at least for me.

    Currently favor either LilGun or IMR 4227 as I am getting consistent SD on my loads with very good accuracy.

    I shoot a bolt, heavy barrel with 1:8 twist.

    Hope this helps.

    Gary
  5. Crracer_712

    Crracer_712 New Member

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    Apr 3, 2012
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    I picked up a M&P 15 300 whisper and will be reloading for the 300 AAC, whenever I find a place that has some LEE dies in stock.

    How are the CCI #41 primers for use in this setup, or is that necessary?
  6. jdon72

    jdon72 New Member

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    Make sure you use sr primers
  7. Crracer_712

    Crracer_712 New Member

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    In case anyone has been looking for Die's, Midway just got the Lee dies back in stock. Still don't have the case length gauge back in stock, but at least I finally got a set of die's coming.
  8. jdon72

    jdon72 New Member

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    Feb 3, 2009
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    My crimp die just came in. Glad yours is here as well.
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