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i think i have a 338 weatherby ultra mag!

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Unread 07-02-2009, 05:17 PM
Silver Member
Join Date: Nov 2006
Location: new mexico
Posts: 243
i think i have a 338 weatherby ultra mag!

got this from my dead machinist as the last thing he built for me.
it's a douglas ss barreled 338 rum.

her barrel measures right about 26.25" plus a touch to the beginning of the muzzle brake. 27.5 oal.

i used a stoney point oal gauge to measure out a 250 sierra gameking last night, finally after waiting for brass to come in, and i got the bullet just touching the mouth of the neck !
so a bit of adding and subtracting, i came up with a jump of .330 , after seating them at 3.650" ! weatherby's have long throats too, so i called it a 338 weatherby ultra mag !

i loaded up 5 rounds with 95 grains of rldr 25 under the 250 and shot her today...

i don't think i need to try anything else...!!

after the 3 shot group, i clicked over 7or 8 clicks, since i miss counted due to my friends muzzle blast ! and fired the one just out from the dot.
my friend shot the last one..

so i have a question since my chrono is acting up and want a reasonable answer quicker than waiting to go to the range again with his chrono...

with the above load and measurements, what do you think my velocity is ?

sighted in dead on at 100 yards i counted clicks and have 93 left for distance... should be good to about 1k i hope.

Last edited by splattermatic; 07-03-2009 at 08:59 PM.
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    Unread 07-02-2009, 05:42 PM
    Platinum Member
    Join Date: Oct 2005
    Location: Michigan
    Posts: 2,232
    Re: i think i have a 338 weatherby ultra mag!

    Nice shooting.

    My Quickload doesn't have the Gameking, but your load with the 250gr SMK shows 3054fps and more than 70k psi (pretty hot).

    That's as close as I can get for you.

    If that velocity is correct, 93 clicks (23.25moa at 1/4moa clicks) will get you exactly to 1000yds at 3000' elevation.

    If some is good and more is better, then too much is just right.

    My mind is a raging torrent, flooded with rivulets of thought, cascading into a waterfall of creative alternatives

    Last edited by AJ Peacock; 07-02-2009 at 05:50 PM.
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    Unread 07-02-2009, 05:54 PM
    Silver Member
    Join Date: Nov 2006
    Location: new mexico
    Posts: 243
    Re: i think i have a 338 weatherby ultra mag!

    alliants web site lists it as a max load, and at 63,??? pressure.
    it was 90 today, and no hard bolt lift, no marks, no signs of high pressure ??

    so good deal. just over 3k.. oh, i'm at about 6k elevation and hunt as high as 10k, if this helps..

    Last edited by splattermatic; 07-02-2009 at 05:59 PM.
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