Pharmseller -- Between the two it looks like eld-x has a higher b.c. and tipped. I have Big Game and IMR 4350 powder which are both listed in the Berger load data provided by HuntnShoot.
Thank you both. I think that is a reasonable starting place.
Scenars typically have shorter ogives than high-BC bullets like the eld's and this holds true for the 150s. So the advantage is, if you can't seat an eld close to the lands due to mag box constraints, you very well may be able to reach the lands with a scenar of the same weight.
