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Thread: 330 Dakota vs 338 Sin

  1. #1
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    330 Dakota vs 338 Sin

    When I started developing the 338 Sin I was told I should just make a 330 Dakota. That would of been easier but my goal was to develop a cartridge that fit std actions with out mods and be able to have the most case capacity safely. That is why I developed the 338 Sin. It is as long as it can be to seat the bullets where they need to be and hold the most powder. I use 330 Dakota brass (made by norma) and I bump the shoulder forward, change shoulder angle, and take out some body taper. Below is a pic of a fire formed 338 Sin and next to it is a 330 Dakota before forming. The 338 Sin will drive a 250gr bullet at 3,000 fps out of a 26" barrel and a 300gr bullet out at 2800 from the same barrel and feed perfect with a coal of 3.500"

    [img width=600 height=360]http://i290.photobucket.com/albums/ll272/sinarms/IMAG0165.jpg[/img]

  2. #2

    Re: 330 Dakota vs 338 Sin

    whats it look like compared to the 338edge speeds look real close at over a 1/4 shorter in oal
    stevens 200 T&amp;T 338edge 30&#39;&#39; shilen shockade PD vortex viper 6.5-20x50 egw 20moa burris xtr <br />and the list of arms goes on

  3. #3
    Paid Member geargrinder's Avatar
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    Re: 330 Dakota vs 338 Sin

    Quote Originally Posted by mopar440
    whats it look like compared to the 338edge speeds look real close at over a 1/4 shorter in oal
    I&#39;ve got a picture of some un-fireformed 338 Sins next to 338 Edge and 338 RUM. Give me a few and I&#39;ll post the picture.
    "Muzzle velocity is a depreciating asset, not unlike a new car, but BC, like diamonds, is forever."-German A. Salazar

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    Paid Member geargrinder's Avatar
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    Re: 330 Dakota vs 338 Sin

    Here it is.

    They are all aligned by the tip of the bullet.

    Left to right

    338 Edge- 3.800" - This is my normal Edge length,
    338 Sin- 3.500" -This is what fits in my Savage Centerfeed DBM
    300g SMK
    338RUM- 3.680" - This is what fits in my factory Rem 700 LSS
    338 Sin- 3.500" -This is what fits in my Savage Centerfeed DBM
    225g NAB

    [img width=600 height=450]http://i234.photobucket.com/albums/ee269/geargrinder123/S8001758.jpg[/img]

    "Muzzle velocity is a depreciating asset, not unlike a new car, but BC, like diamonds, is forever."-German A. Salazar

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    Re: 330 Dakota vs 338 Sin

    The Rum has about 6gr more powder capacity compared to the 338 Sin. The 338 Sin has 13grs more powder capacity then the 330 Dakota, The 338 Sin has about 5grs more powder capacity then the 340 weatherby. So you can see where the 338 Sin falls in comparison. It will shoot right with the edge/rum and be a repeater on any std long action with a magnum bolt face and the availability of the Norma brass is a plus over the edge.

  6. #6
    CJ in WY
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    Re: 330 Dakota vs 338 Sin

    Looks good!
    Now get going on the 7Sin, my 7 Mag needs a new barrel ;D

  7. #7

    Re: 330 Dakota vs 338 Sin

    Quote Originally Posted by CJ in WY
    Now get going on the 7Sin
    Now that would be interesting.

    How has accuracy worked out with the .338? What actions have you built them on?

  8. #8
    Paid Member pdog06's Avatar
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    Re: 330 Dakota vs 338 Sin

    Nice job Devin.

    I commend you on your willingness to try new designs. Looks like this one has worked out just as you had hoped, and I cannot wait to see the 6.5SIN and 7Sin reports.

    I really enjoyed your thread over on LRH. You had alot of nay-sayers on there and have pretty much proved them all wrong. For some reason they cant understand the reasoning behind your thoughts and designs, but what do you expect from those Remmy guys...LOL They would rather spend much more money and end up with the same or less resluts.
    ”I have a very strict gun control policy: if there’s a gun around, I want to be in control of it.”
    ~Clint Eastwood

  9. #9

    Re: 330 Dakota vs 338 Sin

    if you have the data, could you expand on the case capacity comparisons you showed

    338 win mag - xx grn water
    340 - xx grn water
    330 dakota
    338 sin
    338 rum
    338 edge
    338 lapua

    I also think this is an interesting prospect as a rechambering of standard 24" 338 win barrels. Sure longer is typically faster, but this should be a similar expansion ratio as 300wsm perhaps, which performs well in 24" tubes.
    --------Savage - the last refuge for the persecuted left handed rifleman----------------

  10. #10

    Re: 330 Dakota vs 338 Sin

    Looks great Devin! Now when will you be offering loaded ammo?!

  11. #11
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    Re: 330 Dakota vs 338 Sin

    Thanks everyone and yes it is true some people don&#39;t care if they buy an action for $1500, bottom metal and mags for $350, custom stock for $450 just to have an edge repeater or likes when you can pick up a $200 action an a stock $125-400 for the savage and put the same barrel on it. I&#39;m cheap so I like to build stuff as reasonable as I can. Sure a $6,000 Edge would be nice but a $2,000 Savage custom is no slouch either.

    This is a case capacity comparison with H-870

    338 Win Mag 86gr
    330 Dakota 89.5gr
    340 Weatherby 98gr
    338 Sin 102.5gr
    338 Rum 107gr
    338 Norma mag 107gr
    338 Edge 110gr
    338 Lapua 114gr

    From the case capacity stand point it is within 10% of the Lapua and by case design it will work great with shorter barrels, 24-28" for optimum results and could be used in a 20" barrel and still have high velocity. I will mess around later on with larger bullets than the 338cal for big game guys, the 375 Sin will do what the H&H will and maybe more. The 6.5mm and 300 Sin will be next in line as I already have a tester and request for them.

  12. #12

    Re: 330 Dakota vs 338 Sin

    what do use for dies sinman
    stevens 200 T&amp;T 338edge 30&#39;&#39; shilen shockade PD vortex viper 6.5-20x50 egw 20moa burris xtr <br />and the list of arms goes on

  13. #13
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    Re: 330 Dakota vs 338 Sin

    I had a die reamer cut so I make my own dies. I started with RCBS parts but I am switching to redding s type so I can swap bushings because the Norma brass is a little thinner than the remington brass that I started with.

  14. #14

    Re: 330 Dakota vs 338 Sin

    So do you make the die and just use the guts from redding ?
    stevens 200 T&amp;T 338edge 30&#39;&#39; shilen shockade PD vortex viper 6.5-20x50 egw 20moa burris xtr <br />and the list of arms goes on

  15. #15
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    Re: 330 Dakota vs 338 Sin

    Yes sir, I can use just about any of the guts in there from any brand.

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