Accuracy International- 300 WSM - 178 ELDX - Load Data

hafejd30

hafejd30

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Minuteman
    • Feb 27, 2019
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    #1
    Looking for load data on what worked and velocity you’re seeing

    I plan to run

    Bullet: 178 ELDX
    Powder: H4350
    Primer: CCI 250
    Brass: Lapua

    AIAT Rifle with 24” Bartlein- Long range deer killer
    IMG_7675.jpeg

    These are dummy rounds loaded .020” off the lands. See any issue with the amount the bullet seats into the case?
    IMG_7679.jpeg
    IMG_7784.png
    IMG_7678.jpeg
     
    #3
    MK20 said:
    I have had VERY bad pressure issues with hornady bullets in my AIs but both had factory barrels. Work up carefully.
    Click to expand...
    I run these 178’s in my AT in 308 and have for years. So was hoping to try them

    But I’m open to suggestions on what to use. I went Saami spec because I was worried about mag length issues. Wonder how a Berger would measure up?
     
    #9
    MK20 said:
    If you ever want to buy a couple flats of the 178 BTHP let me know. I have about 6000 bullets I can't use, lol. They shoot fine in everything else but my old LW barrel HATES them.
    Click to expand...
    Turns out my 308 and 30 wsm really like the 178 bthp hornady. Had really good performance on deer. In process of reworking load for the wsm due to imr 4451 discontinued. See how 4350 works if I can ever get to the range.
     
    #14
    supercorndogs said:
    How does a particular brand of bullet cause pressure issues when another doesn't?
    Click to expand...
    More bearing surface would be one potential factor. That means more bullet that must be deformed by the lands to be pushed down the barrel and can lead to more pressure. I'm sure there are other factors as well but that's one potential.
     
    #16
    TylerN said:
    More bearing surface would be one potential factor. That means more bullet that must be deformed by the lands to be pushed down the barrel and can lead to more pressure. I'm sure there are other factors as well but that's one potential.
    Click to expand...
    I am aware of that. But thats not a bullet problem....

    That is a reloaders problem, getting pressure trying to skip steps and extrapolating load data for the wrong bullet and/or case.
     
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    #17
    Did some measuring today. I can definitely see why the hornady would experience pressure issues sooner. Not only can you see a difference in bearing surface between the bullets below. But the Berger’s slide smooth and freely in my OAL case neck. I thought I was sent a case with a tighter neck originally as the hornady have definite friction in the OAL case neck. The diameter of the hornady bullets is definitely a touch bigger than both Bergers I tested

    185 juggernaut vs 178 ELDX touching the lands
    IMG_7795.jpeg


    185 VLD Hunting vs 178 ELDX touching the lands

    IMG_7796.jpeg


    I think it’s worth giving the Bergers a shot. The juggernaut will fit in the mag in Saami spec chamber touching the lands. The bearing surface is also closer to the neck which should give more room to achieve better velocity without early pressure signs. Theoretically
     
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