Pushing 300 ultra mag to the limit


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Mr Renwick
August 3, 2010, 10:34 AM
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

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JimKirk
August 3, 2010, 11:10 AM
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/ft 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

Mr Renwick
August 3, 2010, 04:58 PM
Thanks. Do you have any loads you prefer?

Zak Smith
August 3, 2010, 09:00 PM
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.

Mr Renwick
August 3, 2010, 09:47 PM
Great info I appreciate it. Any powder recommendations?

Zak Smith
August 3, 2010, 10:10 PM
Based on my experience with other similar calibers, I would try RL25 and Retumbo.

Mr Renwick
August 3, 2010, 10:30 PM
Cool I have heard good stuff about retumbo.

Kernel
August 3, 2010, 10:42 PM
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.

Mr Renwick
August 3, 2010, 10:47 PM
What if you run it on a heavier bullet like a 210 or 240 gr bullet p

Kernel
August 4, 2010, 12:52 AM
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.

JimKirk
August 4, 2010, 12:34 PM
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

Jeremy Y
August 13, 2010, 12:19 PM
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.

NoAlibi
August 13, 2010, 04:18 PM
Renwick

"His longest field is over a mile long so we should have all the room we need."

Apparently not.

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

MMCSRET
August 13, 2010, 05:50 PM
I've had excellent service from Accurate Magpro in the 300 R.U.M.

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