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    Really Senior Member RCS's Avatar
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    more H&H 300 caliber variations

    More variations and am certain there are more, The US Army tested the last two on the far right for long range sniping back around 1959-1960


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    They sure would get the job done, I'll bet they can do at 900 what a .30 cal can do at 600. Likely with a 30% heavier bullet too.
    Regards, Jim

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    Quote Originally Posted by RCS View Post
    More variations and am certain there are more, The US Army tested the last two on the far right for long range sniping back around 1959-1960
    This is awesome information. I shot the 300 H&H for the first time this week with reloads that I built I loaded 59 grains of IMR 4895 the standard deviation was terrible at 49.2. I was surprised at how smooth the recoil was using the Remington 721.

    Description: 300 H&H Sierra 168gr HPBT 59gr
    Distance to Chrono(FT): 8.00
    Ballistic Coefficient: 0.462
    Bullet Weight(gr): 168.00

    # FPS FT-LBS PF
    9 2963 3275.58 497.78
    8 3025 3414.09 508.20
    7 2988 3331.09 501.98
    6 3057 3486.71 513.58
    5 2999 3355.66 503.83
    4 3008 3375.83 505.34
    3 3048 3466.21 512.06
    2 3102 3590.11 521.14
    1 3104 3594.75 521.47
    Average: 3032.7 FPS
    SD: 49.2 FPS
    Min: 2963 FPS
    Max: 3104 FPS
    Spread: 141 FPS
    Shot/sec: 0.0
    True MV: 3037 FPS
    Group Size (in): 1.53
    Last edited by usabaker; 03-10-2021 at 04:43 PM.
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    Really Senior Member RCS's Avatar
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    Thread Starter

    300 H&H necked down and up

    The 300 H&H was necked down as a factory cartridge called the 244 H&H mag for hunting in Scotland. During the 1930's and 1940's Elmer Keith and his friends O'Neil and Hopkins also used the 300 H&H case to design the 334 OKH (which years later became the basic 338 mag)

    Griffin & Howe designed their own cartridge the 350 G&H magnum based on the 300 H&H

    cartridges in my first photo : 222 rimmed, 5,6x61 Vom Hofe, 244 H&H and 5,6x57 RWS

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    Quote Originally Posted by usabaker View Post
    This is awesome information. I shot the 300 H&H for the first time this week with reloads that I built I loaded 59 grains of IMR 4895 the standard deviation was terrible at 49.2. I was surprised at how smooth the recoil was using the Remington 721.

    Description: 300 H&H Sierra 168gr HPBT 59gr

    Average: 3032.7 FPS
    SD: 49.2 FPS
    Min: 2963 FPS
    Max: 3104 FPS
    Spread: 141 FPS
    Shot/sec: 0.0
    True MV: 3037 FPS
    Group Size (in): 1.53
    That is a lot of variation. I load for 30-40 mainly, weighing charges and using a powder trickler to get them spot-on, My scale will react to a single granule of 4350, so I know the charges are uniform. Yet when I chrono a string of loads I get over 100 fps spread from lower to higher.

    I also load black powder for my 45-70. There my spread on a string of shots is 15-20 fps.

    Maybe it's the primers? Some of mine have been kicking around my shop for a while.

    jn

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    Contributing Member usabaker's Avatar
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    Quote Originally Posted by jon_norstog View Post
    Maybe it's the primers? Some of mine have been kicking around my shop for a while.
    Hi Jon, It could be the rifle didn't like the 168gr bullet and 59 grains of IMR 4895 combo.. I should have worked up several loads but I just wanted to get this rifle out to the range and 59 grains of IMR 4895 was a "safe" load. The primers are less than a year old, If its a component, I'd guess the powder which is a bit old. The old IMR tin can stuff I can't even remember when I bought it.

    I'm all out of 4350 but I have a boatload of Hybrid 100 V and H4831 so I'll try one of those powders next time.

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