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Author Topic: 300 Blackout  (Read 1329 times)

Vector16

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300 Blackout
« on: March 25, 2018, 08:41:33 am »
I have a question regarding primers for the 300 blackout.
Currently I am using H110 with CCI 450 small rifle magnum primers.  I can also use CCI 400 small rifle primers.  My question is, since I am using pistol powder typically used for magnum loads, can I use small pistol magnum primers?
If your are always prepared for an emergency, it seems an emergency will never arise.

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    car-ram-rod

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    Re: 300 Blackout
    « Reply #1 on: March 25, 2018, 12:07:07 pm »
    I used regular primers when I had my blackout
    NRA Pistol, Rifle and Shotgun Instructor
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    Vector16

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    Re: 300 Blackout
    « Reply #2 on: March 25, 2018, 02:38:42 pm »
    Did you use pistol primers?  I just have a lot of the small pistol magnum.
    I was using the Small rifle magnum cause I want the extra pressure to bake the 147FMJBT to still be super sonic and want the 168 JHPBT to still be around 1800 FPS.

    I just really need to know about the Small pistol Magnum primers
    If your are always prepared for an emergency, it seems an emergency will never arise.

    steve2md

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    Re: 300 Blackout
    « Reply #3 on: March 25, 2018, 02:41:00 pm »
    Try a few (as always, back off and work back up). The numbers won't be much different. Pistol vs rifle primers sometimes seat deeper/shallower in the pockets, and pistol primers are sometimes a bit thinner/softer material.
    Heat it till it's hot, then beat it with a hammer until it's the shape you want.    Blacksmith's advice that works for pretty much everything in life

    Vector16

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    Re: 300 Blackout
    « Reply #4 on: March 25, 2018, 05:07:05 pm »
    Okay and if it turns into a full auto cause of slam fire, so be it
    If your are always prepared for an emergency, it seems an emergency will never arise.

    car-ram-rod

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    Re: 300 Blackout
    « Reply #5 on: March 25, 2018, 09:24:03 pm »
    use small rifle primers
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    lesptr

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    Re: 300 Blackout
    « Reply #6 on: March 26, 2018, 04:51:49 am »
    When I first started loading 300BLK, the online resources were calling for small rifle primers. Somewhere along the way, Hodgdon’s online resource was changed to small rifle magnum primers. Since I have 2 AR’s in 30BLK, I went with Federal’s small rifle AR primer so that I would not have to worry about slam fires. Yeah, I bought a case, so I have about 4700 remaining. While that seems to work fine in the ar’s, I have many failures to fire when using my Remington 7, which I’ve been trying to use for load development.
    I had horrible luck with H110. No matter what I tried, I was unable to get groups less than 6 inches at 100 yards using 125gr Sierra match kings.  I talked to several people who also said they were not happy with their results using H110, and they recommended  IMR4227. I’m having better results, but I’m still not happy with the groups. Maybe I’m wanting more than a Remington 7 will deliver with 125’s. I get better results with cheap plinking grade 120gr Remington ammo.
    It’s been an exercise in frustration. At this point I’m pretty much ready to move on and just buy my ammo in this caliber.


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    Vector16

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    Re: 300 Blackout
    « Reply #7 on: March 26, 2018, 06:27:23 am »
    I get great results with H110, CCI 450 and Hornady 168 HPBT. I am using a 16" barrel with a 1:7 twist. It has a pistol length gas tube. 

    I made 20 rounds with the Winchester small pistol magnum. I'll go next Saturday and give it a whirl.
    If your are always prepared for an emergency, it seems an emergency will never arise.

    JarheadAZ

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    Re: 300 Blackout
    « Reply #8 on: March 27, 2018, 07:16:22 am »
    There are crucial differences in primers, and while ignition capability may be one of them, the really important aspect the thickness of the metal in the cup, and how well it can manage the pressures.

    Pistol pressures are lower than rifle, and magnum pressures are higher that pistol or rifle pressures. Using pistol primers in a rifle cartridge is unwise for several reasons. The pressure capacity is one, but the pistol primer is also slightly taller and will usually not seat to the proper depth.

    Rifle and pistol primers are the proper primers to use for non-magnum cartridges/loads because they are properly configured to handle the expected pressures.

    Magnum primers are different product, and while they are suited for igniting longer powder columns, they are really appropriate because of their thicker cups, which handle the pressures better with those expected for a magnum.

    Chasing additional performance by using the wrong primer is not advisable, and may not provide what you're looking for in the first place. I you want higher performance from a given cartridge, prime it appropriately, and adjust the powder charge to gain the necessary performance.

    If the case will not accept the charge volume, switch propellant, or use a bigger case, or maybe reconsider that what you're trying to achieve may be questionable.

    Greg
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    Vector16

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    Re: 300 Blackout
    « Reply #9 on: March 27, 2018, 09:28:53 am »
    If the case will not accept the charge volume, switch propellant, or use a bigger case, or maybe reconsider that what you're trying to achieve may be questionable.

    Okay.  The IMR reloading data specifies a small rifle magnum primer.  Thats why I was curious about the pistol magnum. Its not cause I am chasing performance, its cause I was given 30K of them and only shoot 1 magnum gun. The 357 is about the size case as a BO just less powder.
    If your are always prepared for an emergency, it seems an emergency will never arise.

    thom

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    Re: 300 Blackout
    « Reply #10 on: September 11, 2018, 09:17:51 am »
    Great info to a beginner loader
    Thanks
    Thom
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