I have been looking for some data for this bullet/powder combo for a while now. I finally heard back from berger today and got some good info for the .338 RUM, I know the guys shooting the edge generally start somewhere around the same place as I would. So just trying to get some data out their for something that isn't the hard to find h-1000 and Retumbo. I am not responsible for anything you do with this information, it is untested by me, do with it as you wish, I am only trying to gain knowledge of this powder and bullet combination. Please start your loading at the minimum load or lower and work up slowly.

Dave

Hello David,

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Thank you for your patience while we worked up your Berger Load Data.

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.338 Remington Ultra Magnum

300 Grain, PN: 33556 Bullet, SAAMI 3.600" COAL, 26" Barrel. 11/10/2014 RB

Bullet

Powder

Start Load In Grains

Approx. Start Velocity

Max. Load In Grains

Approx. Max. Velocity

Fill Ratio

300 Grain

Alliant RE-33

88.5

2508

93.2

2660

103%

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We did not list any data for the use of the Hodgdon US 869.* This is due to the fact that it would have had to been loaded to a 111% fill ratio and this would have made it extremely hard to have been able to get this heavy of a powder charge into the case and most likely impossible to have been able to properly seat the bullet, even with extreme compression of the charge.*