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Thread: A question for those that load .300 Blackout

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    A question for those that load .300 Blackout

    I have recently assembled an AR in .300 BLK and will be loading up rounds as soon as I get dies and other components. However, I have a question about which primers to use. In my Hornady manual they use Winchester Small Rifle primers. I assume, then, using standard small rifle primers is fine. Or, should I use CCI #41 primers exclusively? Anybody have slam fire problems with handloaded .300 BLK ammunition using standard small rifle primers? FYI, I have a standard A2 buffer spring in my AR and Hornady used a Smith & Wesson AR-15 for testing their loads (not a "universal receiver").

    Ed
    Last edited by WarEagleEd; 07-10-2014 at 09:53 AM.

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    I've loaded a fair amount of 300blk with CCI small rifle primers (#400 I think) and haven't had a single issue with them. They all go bang when I pull the trigger and don't go bang when I don't

    Btw, my preferred load is 15.7gr H110 under a 150gr FMJBT. The rifle is a standard carbine buffer, mil spec bolt carrier, 16" stainless faxon firearms barrel (1:8 twist) with carbine length gas system. The absolute only issue I've had is it doesn't lock the bolt back on the last shot when firing subsonics without a suppressor. Haven't shot it with a suppressor yet as I'm still paying off the rifle... Damn credit cards...
    Last edited by Mbaker78; 07-10-2014 at 10:18 AM.

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    I haven't had any luck finding H110. I heard that Winchester 296 is the same thing, but I haven't yet confirmed this.

    What dies are you using?

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    Just a lee 3 die set, when forming from 223 I'll strike them 2-3 times just to make sure they're formed right. WW296 is similar in load data to H110.

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    I have no problems. I use 296, H110, H108 and WC820 except for the suppressed loads which I use AA1680. I use CCI small rifle magnum primers. I was using standard CCI small rifle but I had a load that it just would not ignite uniformly and when I went to the magnum the issue went away. Mine is a 16 inch carbine with carbine length gas tube, 1/7 barrel to turn those really heavy bullets. Do you need some formed brass? David

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    Made it to a small gun show yesterday, and walked out with an upper I didn't need in 300 blackout. Guess I need to start paying closer attention to these threads. I will say this, the off the shelf ammo is not cheap, and should make reloading a better option. Now, if you'll excuse me, I need to update what brass I am looking for.

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    Quote Originally Posted by Happyguy View Post
    Do you need some formed brass? David
    I don't need any at the moment, but I'll keep you in mind should I need some in the future.

    Thanks,

    Ed

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    Not sure if this is appropriate or not, but I've heard from a few others that www.carolinabrass.net makes some good 300aac brass. I haven't ordered from them myself, but might if I have need for a few hundred empties.

  9. #9
    Administrator DukeInFlorida's Avatar
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    Get your 300 blackout brass from GRUMPA at castboolits:
    http://castboolits.gunloads.com/foru...php?117-Grumpa

    I have tried BLC(2) for loading some test 300 blackouts, but they didn't make enough gas to cycle the gun properly. I'll be trying H110 soon.

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    Quote Originally Posted by Mbaker78 View Post
    Not sure if this is appropriate or not, but I've heard from a few others that www.carolinabrass.net makes some good 300aac brass. I haven't ordered from them myself, but might if I have need for a few hundred empties.
    I wish I could charge that much and feel good about it......

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    I just make my own from the 223 I generate/pick up at the range... Usually 30-90 per trip. I can buy once-fired 223 locally for $6/100. So basically one rifle feeds the other.

    On a side note, I am starting to get a bit low on loaded 223 ammo

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    Sounds like when I make 9mm Mak from 9mm Luger brass. Or 8mm Mauser from 30.06 or .270.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check