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Load Data for 55g JSP using IMR 4064

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  • August 8, 2025 at 10:55 am #536829
    Timothy Fredericy
    Participant

    I’ve got some 55g pulled JSP bullets I bought here and have been using H335 powder but I have about 20lbs. of IMR 4064 that I would like to use but I can’t find any data in any of my books for that combo. I was wondering if anyone here has some data I could use or at least go by?

    August 8, 2025 at 11:16 am #536831
    Timothy Fredericy
    Participant

    I forgot to say it’s for my AR 223/5.56 16″ barrel.

    August 8, 2025 at 11:16 am #536832
    SC
    Participant

    H335 would be my first choice for that bullet, or see if you can find some surplus WC844, it is the canister powder version of H335. Watch out for scammers selling it online.

    Hodgdon’s online Reloading Center has data for IMR4064. 23.0 starting, 25.7C Max. C=compressed powder

    It is a little slow burning for that application, but may work near the upper end.

    August 8, 2025 at 8:35 pm #536841
    Timothy Fredericy
    Participant

    H335 is my go-to but I have 20lbs of the 4064 that I want to use up just for plinking or at least some of it and save the H335 for my better loads.
    Thanks for the heads-up on the Hodgdon data site.

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