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Thread: 65 grain cast .223 w/ H-335

  1. #1
    Boolit Buddy Krh1326's Avatar
    Join Date
    May 2022
    Behind Enemy Lines, NY

    65 grain cast .223 w/ H-335

    Hello all,

    I have been using published data to load 55 gr cast .223 with 19 grs of H335 with great success, in an AR-15. I do not have a chronograph, but am happy with firearm function, performance and range results.
    I have acquired an MP mold, for 65 gr. I have not found published data for 65 gr , using the H335, that I already have, as of yet. How do I determine how much to reduce my H335, to compensate for the 10 additional boolit grains, and be in the same ballpark, data-wise, as the 55 grs?

    I do understand that there are calculators, that can take all of the input and project expected results, but to be honest, I am a technological dinosaur, and for the life of me, I donít understand a great deal of it.

    Any help would be greatly appreciated.
    Just because itís a bad ideaÖ
    Ö. Doesnít mean it wonít be a good time !

  2. #2
    Boolit Bub
    Join Date
    Apr 2021
    10 grain bullet weight difference should not that big a difference. If still concerned knock 10% off which would be 17.1 and go from there with the H335.

  3. #3
    Boolit Master
    Join Date
    Jul 2015
    Wilmington NC
    Best accuracy for comparison would be helped by a little more data (seating depth, barrel length), but I will make some guesses and run a Quickload comparison.

    With an assumed 0.25" seating depth and assumed 22" barrel, your 55 gr load is estimated to be getting 2317 fps with 19700 psi with a 71.8% fill. I would be very surprised if this is cycling your action and I would guess that there is quite a bit of unburned powder.

    With a 65 gr bullet and the same 0.25" seating depth, a 19.2 gr charge is estimated to give the same velocity with a pressure of 22024 psi and a 72.7% fill. The increase in pressure should give you a little better burn, but it will still be a dirty load.

    To get the same pressure only requires 18.1 grs and you get 2169 fps

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check