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Here is a reasonably good figure to use.



In the following bore sizes



270, 30, 338, 375, 416 and 458 the percentage change between each calibre is almost identical.



If you move down one calibre, such as 30 to 270 then the small calibre will use about the same load with a bullet that weighs 60% of the larger calibre. That is, top loads for a 110 grain 270 will be about the same as top loads for a 180 grain in 30 calibre, using the same case of course.



A 30/06 with 150 grain bullets would be similar to the 338/06 with 250 grainers and ditto for the 30/378 and 338/378.



Mike

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can you load a case with the same charge in different calibers?

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