I know it's a pain, but I would start from scratch. They are different bullets after all.
I've shot both in my rem mag, started with the ELD-M and now use the ELDX. The powder charge for the ELD-M was quite a bit higher than the ELDX from memory, they were very compressed at length but with the ELDX I've got powder moving when I shake the rounds at the same coal.
Hope that helps.
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