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#17264266 05/20/22
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Anyone have suggestions on powder and starting loads for 120, 130, 140 and 155 grain bullets in a .338 RUM necked down to 7mm?


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I wouldn't waste my time with lightweight bullets.
It's got horsepower, launch heavies.

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Thanks. I hope you have a great hunting season.

The 155 is the heavy.


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R25, 26, 33, 50
H-1000
50BMG
Retumbo
AA8700

You're going to be way under top efficiency at 155 grains. If your 155 grain limit stands, stay on the "faster" side of the slow burning powders. I don't go any lighter than 140 and IMR-7828 in a 7-STW.


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Yoder409,

Thanks. Now maybe someone will have some numbers.


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I'd probably start with a middle-of-the-road charge for a 7-RUM with the same bullet as my starting load. You're dealing with right around 5 grains more case capacity than a standard 7-RUM.


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fella did one several years ago, calls it the 7mm Hurricane


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Originally Posted by Ringman
Yoder409,

Thanks. Now maybe someone will have some numbers.

just use 28 Nosler max load data as a starting point


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Originally Posted by Swamplord
just use 28 Nosler max load data as a starting point

You're the man! Thanks.


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