I think I started at 37.0 grs & went up by .3 at a time. I went up to 40.3 grs. with no pressure signs and a little over 3100 fps but settled on 40.0 because it shot well. I was kind of in a time crunch and also only had one box of 50 bullets so I couldn't mess around too much.
There isn't much data out there but reloader's nest has some on their site:
6.5x47L Load Data Most of the Varget data is for 123-130 gr. bullets and most loads were 37.5-38.0 with those bullet weights. I reasoned that 37 would be plenty safe with the lighter bullet. Most important is to work up with a chronograph so you know what's going on. That'll keep you out of trouble. After the season's over I'll probably try some H4350 and RL15 out of it with the 100 TTSX, I suspect both of those will do well also. I'll start about the same way with them by picking a max load for a 120-130 gr. bullet and use that as a starting point for the 100 TTSX.