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Pushing 300 ultra mag to the limit

Discussion in 'Handloading and Reloading' started by Mr Renwick, Aug 3, 2010.

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  1. Mr Renwick

    Mr Renwick Member

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    My friend owns a farm which is where we do all of our long range shooting at. He also owns a 300 ultra mag remington 700 with a 26" fluted barrel. He has been wanting to see how far he could reach out there with it so I would like to get some input on recommended loads/projectiles that will facilitate getting the most range possible. His barrel has a 1 in 10 twist. Also what do you think the peak range will be? His longest field is over a mile long so we should have all the room we need.

    Thanks for your input
     
  2. JimKirk

    JimKirk Member

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    http://www.jbmballistics.com/cgi-bin/jbmdist-5.1.cgi

    Maximum Distance
    Input Data
    Manufacturer: Berger Description: Match Target BT Long Range
    Caliber: 0.308 in Weight: 185.0 gr

    Muzzle Velocity: 3300.0 ft/s

    Temperature: 59.0 °F Pressure: 29.92 in Hg
    Humidity: 0.0 % Altitude: 0.0 ft

    Std. Atmosphere at Altitude: No Pressure is Corrected: Yes
    Output Data
    Atmospheric Density: 0.07647 lb/ft³ Speed of Sound: 1116.4 ft/s

    Initial Angle: 33.8 deg Terminal Angle: 64.8 deg
    Terminal Range: 5866.7 yd Terminal Velocity: 497.7 ft/s
    Terminal Time: 34.2 s Terminal Energy: 101.8 ft•lbs


    Jimmy K
     
  3. Mr Renwick

    Mr Renwick Member

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    Thanks. Do you have any loads you prefer?
     
  4. Zak Smith

    Zak Smith Moderator Emeritus

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    Best long-range performance will be with one of the over 200 grain high-BC bullets, such as the 210/220 gr SMK, 240gr SMK, 210gr Berger VLD.

    A 240gr SMK fired at 2875 fps will still be supersonic at 1800 yards, but barely.
     
  5. Mr Renwick

    Mr Renwick Member

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    Great info I appreciate it. Any powder recommendations?
     
  6. Zak Smith

    Zak Smith Moderator Emeritus

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    Based on my experience with other similar calibers, I would try RL25 and Retumbo.
     
  7. Mr Renwick

    Mr Renwick Member

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    Cool I have heard good stuff about retumbo.
     
  8. Kernel

    Kernel Member

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    Plugged the .300 RUM w/185 grain bullets into my modified Powley Computer. It buried the “speedometer” at the slow end of the dial -- showing the ideal speed in the range of powders like RL25 and H870.
     
  9. Mr Renwick

    Mr Renwick Member

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    What if you run it on a heavier bullet like a 210 or 240 gr bullet p
     
  10. Kernel

    Kernel Member

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    A heavier bullet will want an even slower powder. Ligher bullets a faster powder. With 125 gr bullets the speedometer points to powders like RL19, N560, & H450.

    Though the jump from 185 to 210 is not enough to move the needle much. A jump to 240 would be significant and likely benfit from something slower.
     
  11. JimKirk

    JimKirk Member

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    Hornady # 7 Reloading Book shows for a 220 grain bullet ...

    For 3000 fps:

    91.2 grains RL25 Max

    96.1 grains Retumbo Max

    101.4 grains AA8700 Max

    For 2900 fps:

    83.7 grains IMR 7828 Max

    87.5 grains H1000 Max


    I helped a friend work up loads for his 300RUM ... we used 190 grain Hornadys BTSP for a Western Elk and Bear trip. We also used IMR 7828, but I don't have the data we used, I wrote it down and sent it with him to keep. Hornady shows 89.0 grains IMR 7828 for a 190 grain.

    Jimmy K
     
  12. Jeremy Y

    Jeremy Y Member

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    My good .300 RUM Loads

    I have been getting excelent results out of my customized Rem 700 CDL using 87.0gr IMR7828, CCI Large Rifle Magnum primers, Remington Brass, and Nosler Accubond 180gr bullets seated to 3.600" COL. I have gotten even tighter groups using the same recipe, only changing from the Nosler bullet to the Hornady A-Max Moly 178gr. at the same COL.
     
  13. NoAlibi

    NoAlibi Member

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    Apparently not.

    Refer to Post #2: Terminal Range: 5866.7 yd = 3+ miles
     
  14. MMCSRET

    MMCSRET Member

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    I've had excellent service from Accurate Magpro in the 300 R.U.M.
     
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