Recommendations for H335 in 5.56?

Discussion in 'Handloading and Reloading' started by SunnySlopes, Feb 6, 2021.

  1. SunnySlopes

    SunnySlopes Member

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    I’m working up some loads for 5.56 cal. I’ll shoot them in one of three ARs: Daniel Defense; S&W M&P 15 PC; Ruger 556. I typically load light except for semiautos where ejection is an issue.

    I’m using Hogdon H335 which I’ve never used before and there’s a significant disparity in load data.

    Hogdon data on the powder container (and in their Basic Reloading Manual dated 2006) is 25.3 grains for a 55 grain bullet. Hogdon data on their website is 21.3 grains starting, 22.7 grains max.

    The Speer reloading manual (circa 1979) for that same powder is 25.0 grains starting, 27.0 grains max.

    This isn’t unusual as I’ve observed the disparity in load recommendations throughout my 40 years of reloading. But it doesn’t hurt to ask.

    These are plinking/paper punching loads as I have commercially loaded rounds for hunting and hd.

    Speer says start with 25.0 grains. Hogdon’s website says start at 21.3 grains.

    Speers says maximum load is 27.0 grains. Hogdon’s website says max load is 22.7 grains.

    The powder container flat out gives the load as 25.3 grains.

    Even Hogdon’s own references conflict.

    Recommendations for a load that will enable the AR to function properly within safe parameters?
     
  2. mrawesome22-250

    mrawesome22-250 Member

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    The Hodgdon data you are looking at is for a 55gr Barnes solid copper bullet. Solid copper bullets are longer and use different data than cup and core bullet designs.

    25.0gr H335 with a 55gr FMJ has been very accurate in many different AR's I've tested. However, I have an AR with a barrel that has a tight gas port that measures .078" on the nose and refuses to cycle this load properly.

    I have since moved on to 27.5gr BL-C2 under a 55gr. This load is very accurate and has always locked the bolt back every single time on my tight gas port barreled AR.

    27.0gr BL-C2 under a 62gr FMJ is another load I have found to be very accurate with a wide variety of rifles.

    All my rifles have either mid-length or rifle length gas port locations.
     
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  3. TxWolf

    TxWolf Member

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    I put 24.5 grains under a 55gr bullet. Shoots good in my bushmaster. Winter, spring ,summer and fall.
     
  4. ImjinScout85

    ImjinScout85 Member

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    This is my exact load also, very good and reliable load
     
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  5. wankerjake

    wankerjake Member

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    24.5-25gr for a 55gr bullet seems to be the sweet spot for most people. The data is confusing I agree
     
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  6. SunnySlopes

    SunnySlopes Member

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    I'm using Nosler Armageddons FBHP and Nosler's website says 24 grains 335 is the most accurate with 25 being max.
     
  7. jonas66
    • Contributing Member

    jonas66 Contributing Member

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    With 40 years reloading under your belt you have vastly more experience than I do.

    I can offer an observation:

    In an older Sig M400 with both 55gr and 62gr fmj, I have gone as low as 18 grains H335 and as high as 25.5 grains and had the weapon cycle fine with no negative consequences.

    That is both the original 16" Sig upper with a carbine length gas system, and a newer 16" PSA upper ( I know, I know. Laugh it up. :) ) which had a mid-length gas system.

    I have neither a chronograph nor any means of measuring pressure so that's just anecdotal reference.

    ETA:
    --at 25.5 grains H335 under the 62g fmj -- that was getting to be a bit of a sporty round, especially with the carbine length gas system. I'm probably not going there very often.
     
    Last edited: Feb 6, 2021
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  8. Charlie98

    Charlie98 Member

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    I run between 23.5-24.5grn H335 with 55’s, works well enough. I don’t think pushing the the pressure envelope is a smart idea in the AR, so I don’t go there.
     
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  9. HDMontana

    HDMontana Member

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    23.8 of H335 works well in my ar's.
     
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  10. mmb617

    mmb617 Member

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    H335 at 23.7 with 55 gr FMJ gives me 2725 fps in my M&P AR and always cycles. Good enough for plinking in my book.
     
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  11. JCSC

    JCSC Member

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    H335 @ 24-24.5 gr and a hornady 55 fmjbt at 2.25. Cycles my action well and great blasting ammo.
     
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