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300 ultra mag load data

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Unread 05-17-2008, 08:56 PM
Platinum Member
Join Date: Nov 2003
Location: Washington State
Posts: 2,726
Yeah guys,

Install the Wyatts box. 4" OAL and controlled centerfeed. Much better than the stock unit in terms of allowed OAL and the controlled cenerfeed is much more reliable. But only 2 down instead of 3--who needs those anyway? Have to play with the wings a bit. I've found for my RUM, the 240 SMK likes being right on the lands as well. Have fun tinkering...
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    Unread 05-17-2008, 09:22 PM
    Platinum Member
    Join Date: Feb 2005
    Location: USA
    Posts: 2,598
    Originally Posted by stxhunter View Post
    i'm haveing a wyatts mag installed in my 300 rum right now you might try the 200 ab behind 95 gr retumbo its really accurate in my rifle and is the go to load for alot of rum shooters on this forum will get between 3100 and 3200 fts

    95 grains of Retumbo behind the 200 AccuBond is an excellent load..
    range it,check the wind, dial in correction, aim and only one shot
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    Unread 05-18-2008, 01:42 PM
    Junior Member
    Join Date: Apr 2007
    Posts: 14
    Talked to the gun smith he is going to get me a mag box extender.
    thanks for all your help

    I'll let you no how it all turns out

    Thanks again guys
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    Unread 05-22-2008, 08:17 AM
    Bronze Member
    Join Date: Apr 2008
    Location: Echo Bay, On Canada
    Posts: 39
    stxhunter, ive herd thats a good load and im hoping to try it soon, but do you know if retumbo is temp sensitive ??
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    Unread 05-22-2008, 06:55 PM
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    Join Date: Aug 2006
    Location: corpus christi tx
    Posts: 424
    i chrono my loads in august it was around 95 dg and they where running 3160 fps av. i haven't chrono them in the cooler months yet but have not notice a change in impact shooting in the winter. but heck it can be 80 dg here in south tx in dec or jan we might only get aweek or so of really cold weather below 40 all winter. but from what i've read on this site is that it is pretty stable
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    Unread 05-25-2008, 09:35 AM
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    Join Date: Apr 2008
    Location: Echo Bay, On Canada
    Posts: 39
    just wondering about that cause where i shoot it can be around 0 or colder and i wanted to know if the powder was going to be relieable or not
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    Unread 12-12-2012, 08:41 PM
    Junior Member
    Join Date: Feb 2012
    Posts: 27
    Re: 300 ultra mag load data

    Your best money spent is on a wyatts extended box. Get the 4inch box the 3.850 will work but as you shoot your gun the throat will continue to grow beyond 3.850 and you will be chasing accuracy again. I had it done to my 300 ultra, groups went below one inch. I then had it glass beaded and it will shoot half inch groups all day.
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