I think the 147 is going to be a little heavy out of the x47. it runs pretty good out of the 6.5 creed, but that case has more capacity. I tried the 140 (and 130) eld-m and berger hybrids. I found the best one to be the 140 eld-m. it was faster than the 140 berger for the same powder charge (less bearing surface) and more consistent. I think the bergers are good, but to top the eld you would need to spend the time cutting and pointing the meplet. I spend a fair amount of time trying to get the most consistent loads I can, but don't want to have to go that far. so, for the the eld-ms are the way to go.
I also had good luck at 37.0, but my best was 38.0 of varget out of a 26" tube. getting around 2840 and it was dead on with the listed G7 BC and that velocity out to 900 and only .1 low at 1000. not even sure I could true that out. from a bunch of the guys I shoot with, even in the 6.5 creed, 2820-2840 seems to be a sweet spot with the 140g eld-m. my creed shooting buddies have pushed it harder, but they started to get poor results.
fwiw, the 38.0g of varget in the 140 eld is 7.9mils to 1000, which is pretty good. I haven't gotten to play with the RDF yet, but the ELD-Ms are shooting so well, i'm not going to bother with them in this barrel.