Load Data For .375 H&H (P.O. Ackley Improved)

Discussion in 'Reloading' started by bohemian, Jun 5, 2011.

  1. bohemian

    bohemian New Member

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    Looking for Load Data For .375 H&H (P.O. Ackley Improved)

    have not had any luck so far finding any load data yet.

    thanks in advance.
  2. sestoppelman

    sestoppelman SILVER SUPPORTER AH Legend

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    According to Ackley himself, the 270 gr bullet is maxed at 81 grs of 4064 for 2830 fps. The 300 gr is maxed at 78 grs of the same powder for 2630 fps or 88 grs of 4350 for 2740 fps. List also the 350 gr bullet at 88 grs of 4831 for 2650 fps. There is other info out there just by Googling.

    Have fun!
  3. bohemian

    bohemian New Member

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    thanks for the info, while I found plenty of general historical info googling I was amazed at how difficult it has been to find any .375 H&H Improved (P.O. Ackley) load data on the internet... I don't know maybe my google fu isn't quite up to snuff for this kind of search...
    Any suggested links would also be most welcome...

    Is there a cartridge over all length with and without a seated projectile listed in the P.O. Ackley information you have?
    Is the 4064 you itemized IMR 4064?

    thanks in advance.
  4. sestoppelman

    sestoppelman SILVER SUPPORTER AH Legend

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    None of the powders listed specified but I can pretty much tell you that in that era, IMR was the only 4064 and 4350. The 4831 could be either H or IMR but no mention. My guess would be IMR again per the era.
    As to lengths, no mention in Ackley however in my Manual of Cartridge Conversions it shows: Case length at 2.83 and OAL at 3.75 inch. Of course that could easily vary somewhat as to actual chamber dimensions of the rifle.
    Were it me I would limit my powders to the slower ones, 4064 is good stuff but full velocities wont be realized before pressures exceed max.
  5. bohemian

    bohemian New Member

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    ok, thanks again.

    interesting that the c.o.a.l. is so much longer than the parent .375 H&H c.o.a.l. I found on barnes site...

    they have 3.545"-3.575" for c.o.a.l. depending on projectile used...
    and 2.840" for c.l.

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