There might be someone who has weighed these packs before but generally anything outside of the original era is less cut and dry/known. The best way to do it yourself would be to weigh a bunch and compare them. It should be extremely easy to see the relative differences. If you don’t have 10+ packs to use, though, you might be SOL because these packs are super hard to find and not many people are opening them like they are Base/Jungle/Fossil/etc. Tough situation to be in. Sorry I can’t help much more.
Kind of convenient, but I literally just opened an EX Dragon pack yesterday lol. It was 17.42 and had a holo. Almost all of my EX Dragon packs are below 17.3 — anything above 17.5 should 100% have a holo, if I had to guess. I only have one above that weight 17.4 is likely the low end for having a holo, if I had to guess.
Yup, that should definitely be heavy. I have ~12 loose packs and only a single one above that weight lol. I also opened a TMTA and a FRLG pack yesterday, which also both had holos and they weighed 17.47 and 17.5, respectively.
I think that a few sets are different, though. Deoxys and TRR, I believe, are only heavy above 17.6-ish. I have a Deoxys pack that I bought as light from TCA gaming last fall and it weighs 17.39. For Unseen Forces or Emerald, 17.39 would be super heavy, based on the packs of those sets that I have (which are mostly in the 16.8 to 17 range).