Hodgdon RETUMBO is an extra-large powder that was specifically designed for the big overbooked cartridges such as 7mm Remington Ultra Magnum, 330-378 Remington Ultra Magnum, etc. When compared to other normal magnum powders,
RETUMBO increases the velocity of these cartridges by 40 to 100 fps. It is also an extremely strong powder, which makes it perfect for hunting large game under all sorts of conditions.
Smokeless Powder Warning: Do not exceed the loads listed in the reloaders handbook.
Mixing two powders, regardless of type, brand, or source, is never a good idea.
Never use a smokeless powder in place of black powder or a replacement for black powder.
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