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Thread: cast boolits in .375 JDJ

  1. #21
    Boolit Master
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    Quote Originally Posted by missionary5155 View Post
    Good afternoon
    Is the 375-06 and the 375 JDJ the same beast ?
    No they are not: 30-06 and 444 Marlin parent cases.

  2. #22
    Boolit Master


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    A very simple internet search of JDJ cartridge will allow for self education and answer the question quickly if the JDJ anything is related to the 375/06. JDJ is not a new outfit, they have been putting out creations for decades.

    http://www.ammo-one.com/JDJcartridges.html

    An article from 1979:

    https://gunsmagazine.com/featured/jd...is-cartridges/

    and his work on pushing the 30-06 to its max potential!

    https://en.wikipedia.org/wiki/.30-06_JDJ

    Ken
    ΜΟΛΩΝ ΛΑΒΕ
    Je suis Charlie
    Remember Lavoy!
    I'll cling to my God and my guns, and you can keep the "Change".

  3. #23
    Boolit Buddy
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    Good info gents. Thanks.

    Missionary5155, no they are different cartridges. The .375/06 JDJ is based on the .30/06 case and I just can't remember the parent cartridge for the .375 JDJ. The 06 version is just larger overall and will blow up a Contender.

    Jim, like you I'm not interested in super high velocity, yes 2000 fps is plenty. I'm also considering casting for .45/70 and that did the job at even lower velocity. Big bullets just aren't married to high velocity to get the job done.

    I like the flat meplat on that bullet LAR. That's what I'd be looking for too. Somewhere on the 'net I ran across a wound channel calculator (It was on a bullet casters site) and flat meplats work great. I think it was Elmer Keith that used big bullets that didn't expand (unknown velocity) and he stated that, "You can eat all the way to the hole.". Meaning that bullet damage was minimal. I think he used a .375 H&H but I could be wrong. I can't fully see that data in my mind due to the dust and cobwebs it's covered with.

  4. #24
    Boolit Buddy Jim22's Avatar
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    Quote Originally Posted by missionary5155 View Post
    Good afternoon
    Is the 375-06 and the 375 JDJ the same beast ?
    No, they are not the same at all. The .375 JDJ, like many JDJ wildcats is based on the .444 Marlin case necked to .375. This gives a rim and the capacity is between the .30-06 and the .308 Win.. J.D. Jones invented them for TC Contenders for hunting. He took the .375 JDJ to Africa with some amazing results.

    https://press.hornady.com/assets/sit...ta/375-jdj.pdf

  5. #25
    Boolit Grand Master



    missionary5155's Avatar
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    Thank you each for the good explanations. I was looking for information as to the ending cartridge length and capacity and it some digging to finally find it.
    "Come unto Me, all you who labor and are heavy burdened, and I will give you rest." Matthew 11:28
    Male Guanaco out in dry lakebed at 10,800 feet south of Arequipa.

  6. #26
    Boolit Buddy Jim22's Avatar
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    Surprisingly, the two cavity RCBS .375-250 FNGC mould I ordered arrived. They told me it was back ordered but some must have come in. I cast a hundred or so yesterday from 90-5-5 alloy and today sized, lubed, and installed gas checks. Carnauba Red lube. The bullets turn out to weigh 260 grains with gas check and my alloy. The bullet has three lube grooves plus the half a groove just above the gas check. I'm a bit concerned about over-lubing and smoke.

  7. #27
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    lar45's Avatar
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    You don't have to lube all of the grooves. Try some with only 1 or 2 and compare barrel condition, accuracy, smoke...

  8. #28
    Boolit Buddy Jim22's Avatar
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    Quote Originally Posted by lar45 View Post
    You don't have to lube all of the grooves. Try some with only 1 or 2 and compare barrel condition, accuracy, smoke...
    Will do. The first batch has all grooves filled. Next batch I will lube one less and see.

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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