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I need to push a 180g 30cal over 4000fps what are my options

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  #22  
Unread 07-08-2010, 03:22 PM
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Re: I need to push a 180g 30cal over 4000fps what are my options

Quickload has two huge 30 calibers, the 300 Pegasus and 300 RUMBO.

I have heard of the Pegasus but not the other. The Pegasus is pretty much a rimless 30-378 Weatherby. If you improved that to the max, and put a 40" (yeah that's long :() barrel on it...you may get sorta close.

I'll do some Quickload figuring when I'm on the other computer!
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  •   #23  
    Unread 07-08-2010, 03:43 PM
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    Re: I need to push a 180g 30cal over 4000fps what are my options

    Pegasus is a beltless. 30/.378 weatherby. Rumbo is a .300 rum improved and shortnecked way be ackley specks
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      #24  
    Unread 07-08-2010, 05:09 PM
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    Re: I need to push a 180g 30cal over 4000fps what are my options

    QuickLoad have any programming intended for application of the new breed of banded bullets? I think not from what I've read. The load and pressure data for the banded bullets is a fair amount different than for conventional full caliber bullets, based on what I've read and understand.
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      #25  
    Unread 07-08-2010, 05:46 PM
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    Re: I need to push a 180g 30cal over 4000fps what are my options

    300 Pegasus Improved (theoretical, 145 grain case capacity)

    40" barrel

    173 grain GS Custom bullet seated .2" into the case neck.

    70k psi max pressure

    136.1 grains ADI AR 2218-4064 fps

    129.6 grains Vihtavouri N570-4020 fps



    So according to Quickload it can be done. Would be the edge of pressure assuming calculations are all correct. Also, 40" is a dang long barrel. If you're gonna do that, might as well bump it up to 46".

    Velocities are well over 4100 fps...or you could reduce loads to just be at 4000 fps.

    Either way it's not very feasible, but would be a neat project for some short term fame.
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      #26  
    Unread 07-08-2010, 05:52 PM
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    Re: I need to push a 180g 30cal over 4000fps what are my options

    Of course if 4000 fps isn't enough, you should be able to push the 86 grain Hornady pistol bullet over 5000 fps!

    Nothing like 5000 ft lbs with something weighing less than an 87 grain Vmax.
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      #27  
    Unread 07-09-2010, 06:56 AM
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    Re: I need to push a 180g 30cal over 4000fps what are my options

    I like where this whole thing is going. Thanks for racking your brain's guys this is great
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      #28  
    Unread 07-09-2010, 08:41 AM
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    Re: I need to push a 180g 30cal over 4000fps what are my options

    You could have Pac-Nor make a 36" 50 BMG 0.510" groove barrel with a 10" twist (a standard option) which could shoot 30 caliber bullets in sabots with up to 300 grains bullet plus sabot weight at 4000+ fps at 90% of SAAMI pressure with decent barrel life. Loads of around 260 grains of VV N560 (depending on sabot design and seating depth) would do the job. I expect most jacketed lead 30 cal bullets would just blow up at 288000 rpm but copper alloy solids should survive.

    I haven't tried a fast twist 50 BMG but it sounds like a fun project. I've shot 55 grain 224 bullets at over 4250 FPS in sabots from a 10" twist 300 Win Mag. With the larger bore barrel life is much improved. Look at how the US Army gets 5500 FPS from the 120mm cannon on the Abrams tank. The projectile is only 27mm, but are fin stabilized.

    Last edited by LouBoyd; 07-09-2010 at 08:52 AM.
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