AR .223 with IMR 4320?

Discussion in 'Ammunition & Reloading' started by CaptCrunch, Aug 8, 2013.

  1. CaptCrunch

    CaptCrunch New Member

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    Hi folks. New to forum and reloading. Just bought a del-ton echo 316H and looking to get into reloading. I have a Lee breech lock challenger single stage press. Had allot of trouble finding powder so took what I could find. I ended up with IMR 4320. Anybody building ammo for AR with this powder? Also wondering about use of the varmint nightmare bullets in a 16" 1:9 barrel. It's a faster twist than spec'd but with a shorter barrel I was thinking muzzle velocity and hence rotational forces would be lighter with shorter barrel.

    Thanks!
     
  2. gunnut07

    gunnut07 New Member

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    http://www.imrpowder.com/

    You can load with it. But, it has very large grains and you might get some stuck in the case. You are going to be getting very full cases and many of the top end loads are going to be compressed loads. You might need to use a powder drop tube of 4 to 6" in length to get all the powder in the case. The powder isn't going to meter very well either because of the large grains.
     

  3. mseric

    mseric New Member

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    The Midsouth Varmint Nightmare bullets will do just fine in your AR. If you don't have them already, you better act fast as the only ones in stock are my favorite 55gr Hollow Point and they will not last long.

    http://www.midsouthshooterssupply.c...3=.224+DIA&dept4=TRADITIONAL&vendors=MIDSOUTH

    Note sure what you are getting at here, sorry.

    The twist rate listed in the loading manuals is of little importance, I ignore it.

    Your barrel length will affect velocity and that's about it. If your load data used a 24 inch barrel then expect the same load in your 16 inch barrel to be about 200fps less.

    Your 1-9 twist is a good compromise between the 1-7/1-12 twists out there. You will be fine with bullets from 50 to 70gr. You may even have good luck with lighter or even heavier, but to start out I would go with the 53-55gr.

    From Hodgdon on IMR 4320.

    Short granulation, easy metering, and perfect for the 223 Remington, 22-250 Remington, 250 Savage, and other medium burn rate cartridges. Long a top choice for the vintage 300 Savage cartridge as well.

    You will be fine with this powder, just expect your charges to fill the case and eventually compressed. Don't get nervous about "compression" it is perfectly safe and preferred by many.

    Note the "C" in Hodgdon's data after the max charge if 4320 with 55gr Speer SP. The "C" means compressed and is expected and it's going to happen, go with it you will be fine. Just add the powder slow or with a long drop tube so as not to spill it over the top.

    http://data.hodgdon.com/cartridge_load.asp
     
  4. TexasGunner

    TexasGunner New Member

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    Now that is good info. Thanks! I wondered what the "c" following some of the max loads meant. They've never followed any of the loads that I've done or I would have inquired about it. You learn something new every day!
     
  5. CaptCrunch

    CaptCrunch New Member

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    Thanks to all for detailed replies. Good to know about the compressed loads. That would have concerned me for sure.

    I have not purchased bullets yet but I guess I'll stick exactly to the recipes to start with. The price on the varmint nightmare makes it very interesting though.

    One last question for now. I have the single stage Lee press but was also considering the Lee classic loader. I have heard there might be problems in a semi- auto without the full length re-size. Is this true even if the brass has only been fired in my gun?

    Thanks!
     
  6. mseric

    mseric New Member

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    Yes, all semi-autos require a Full Length size.

    Failure to do so can cause all sorts of problems from simple jamming to slam-fires or even out of battery fires. Although the latter two are almost impossible in an AR platform, "almost" isn't good enough.

    This is a good read on handloading for semi-autos. Pay particular attention to the section on sizing.

    http://www.exteriorballistics.com/reloadbasics/gasgunreload.cfm
     
  7. CaptCrunch

    CaptCrunch New Member

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    Thanks! Looks like I'm going to stick with full length re-sizing. Thanks for the link too. I need all the information I can get.
     
  8. bntyhntr6975

    bntyhntr6975 New Member

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    Some autos work better with small base dies rather than the normal full length sizer. Basically, it just undersizes them a little. Not saying you'll need the SB dies, but you might check into them. The RCBS AR series dies work very well for me.
     
  9. gunnut07

    gunnut07 New Member

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    As long as you full length size your brass it will be fine. No need to waste money of small base dies IHMO.
     
  10. bradam

    bradam Member

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    great site, am new to reloading and that site is very informative. Thank you
     
  11. samnev

    samnev New Member

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    Small Base Dies.

    Agreed ^^^^^ I reload for many semi's using RCBS and Lee dies for 30+ years and never have had to use small base dies.
     
  12. MOshooter

    MOshooter New Member

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    Reloading for a semi auto will need to be full length sized or small base resized.
    I had to go with the small base resizing dies for a 30-06 semi auto I have and since then I buy the small base die sets on all my semi auto rifles.

    They just seem to work better for me?