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.*
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