Reloading for 300 Blackout

The #1 community for Gun Owners of the Northeast

Member Benefits:

  • No ad networks!
  • Discuss all aspects of firearm ownership
  • Discuss anti-gun legislation
  • Buy, sell, and trade in the classified section
  • Chat with Local gun shops, ranges, trainers & other businesses
  • Discover free outdoor shooting areas
  • View up to date on firearm-related events
  • Share photos & video with other members
  • ...and so much more!

    • Register Log in
    M

    My Toy

    Ultimate Member
    Jul 31, 2008
    1,207
    Westminster
    I've just started handloading for 300 Blackout and have been only using W296 (same as H110) with 125 gr., 130 gr., and 150 gr. projectiles. Have not had a chance to chronograph any loads yet so I've been loading on the conservative side. When using an almost equivalent charge of powder in .357 Mag I think some manuals recommend a magnum small pistol primer ( I always thought because some ball powders are a little harder to ignite). But I don't think I saw any manuals that use other than standard small rifle primers in 300 Blackout.
    Has anyone here used Small magnum rifle primers with W296 in 300 Blackout?
     
    85MikeTPI

    85MikeTPI

    Ultimate Member
    Jul 19, 2014
    2,728
    Ceciltucky
    I use MSRP as standard in 300blackout, no so much for the charge burn, but for the harder cup to protect against mis-fires with
    the AR floating firing pin...
     
    edrod68

    edrod68

    Active Member
    Jun 6, 2013
    664
    Westminster, MD
    I have used the CCI #41 military small rifle primers in mine so far.... have reloaded using IMR 4227 and CFE BLK so far and have had zero issues with it...
     
    J

    JMV

    Member
    Mar 29, 2019
    19
    I’ve used small rifle primers in my 300 loads with mostly CFE BLK… 220 gr projectiles. No ignition issues


    Sent from my iPhone using Tapatalk
     
    G

    GunBum

    Active Member
    Feb 21, 2018
    751
    SW Missouri
    I use small rifle primers and have had no issues with H110/296 or H4227.

    Zero issues with ignition. Zero issues with firing pin bounce.
     
    John from MD

    John from MD

    American Patriot
    MDS Supporter
    May 12, 2005
    22,903
    Socialist State of Maryland
    I have been using standard rifle primers in my 300 BO without issue for 5 years? I have pushed the limits with them and never had a primer burn through. I have had primer pockets loosen up but that is just do to the power level I load them to.
     
    outrider58

    outrider58

    Eats Bacon Raw
    MDS Supporter
    Jul 29, 2014
    49,982
    E.Shell said:
    Originally Posted by 85MikeTPI View Post
    I use MSRP as standard in 300blackout, no so much for the charge burn, but for the harder cup to protect against mis-fires SLAM-FIRES with the AR floating firing pin...
    Click to expand...

    FIFY
    Click to expand...


    Out of thousands of rounds in .223/5.56 and 300Blk I have reloaded and shot, I have never experienced a slam-fire. With the exception of using BR primers on my 300Blk subs, I usually use Winchester SRPs for reloading all the rest, which are known for their softness. No issues at all.
     
    E.Shell

    E.Shell

    Ultimate Member
    Feb 5, 2007
    10,306
    Mid-Merlind
    outrider58 said:
    Out of thousands of rounds in .223/5.56 and 300Blk I have reloaded and shot, I have never experienced a slam-fire. With the exception of using BR primers on my 300Blk subs, I usually use Winchester SRPs for reloading all the rest, which are known for their softness. No issues at all.
    Click to expand...
    No slam-fires for me either, and I've shot a few myself, but people say it happens. I do know the harder cup won't discourage mis-fires, LOL.

    I did see a slam-fired AR-10 in .260 gut itself right in front of me. Cartridge fired out of battery. A student had handloaded his ammo with loose primers and the primer backed out during cycling and got pinched sideways when the bolt went sorta home. Surprised it ignited the powder, even more surprised to see parts and pieces. Blew the mag apart, split the upper, damaged the cartridge case. Glad no one was hurt.
     
    M

    My Toy

    Ultimate Member
    Jul 31, 2008
    1,207
    Westminster
    E.Shell said:
    No slam-fires for me either, and I've shot a few myself, but people say it happens. I do know the harder cup won't discourage mis-fires, LOL.

    I did see a slam-fired AR-10 in .260 gut itself right in front of me. Cartridge fired out of battery. A student had handloaded his ammo with loose primers and the primer backed out during cycling and got pinched sideways when the bolt went sorta home. Surprised it ignited the powder, even more surprised to see parts and pieces. Blew the mag apart, split the upper, damaged the cartridge case. Glad no one was hurt.
    Click to expand...

    I’ve never seen a disaster like this happen first hand but have seen many firearms that were blown to bits after the fact (always as a result of faulty handloads). I always check and recheck my hand loading operations. One careless mistake in addition to destroying your rifle could take your vision or worse.
    Thanks to everyone for the replies. Always fun exploring a new to me cartridge.
     
    You must log in or register to reply here.

    Users who are viewing this thread

    Total: 2 (members: 0, guests: 2)
    Kind Sniper banner ad

    Latest posts

    Forum statistics

    Threads
    275,372
    Messages
    7,279,152
    Members
    33,442
    Latest member
    PotomacRiver

    Latest threads

    Top Bottom