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Switching from 140 amax to 140 eldm?

Yes the ELDs will be as accurate but at longer ranges you will see a difference with the higher BC of the ELDs. Better in wind and slightly flatter shooting.

For loading I would drop the load maybe .5 grns just to be safe as it is a different bullet but it won't be much different.
 
Personally I’d work up a new load. It really doesn’t take long and it helps get the most out of it.
Using Rob’s advice i had mine seated .020” off the lands and it shot so well I didn’t mess with it.