.280 Ross loads for retumbo?

[bagograss]

Thanks for the info would imr 3031 be a more sutible powder? If so what would be a good starting load for 154gr jacketed bullet? I bump them to .287.

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[browningautorifle]

a more sutible powder

Whatever the books recommend is what you should use. Asking for an unsubstantiated opinion is asking someone to give you permission to damage a rifle, without any liability on their part. If it ain't in print in a big manufacturer's book I wouldn't use it.