36.5 grains of Varget is giving me 2750 with 140 ELDM'S from a 26" Bartlein. No pressure issues and wickedly accurate.
Not sure about 6.5x47 USA, curious though.
The current lot I'm shooting has 21 firings. They haven't all been the above mentioned load, mostly 37 grains of RL-15 with a 130 VLD.
I did lose one case after the 19th firing to a split neck.
Annealing? I was trying to recall my load of 4166. I remember starting at 36 but i think i'm at 37 now, and my pockets are getting loose on this second hand brass. They're on 9 firings or so. Though it's second hand from a different chamber that was claimed to only have been shot twice, which very well could be the case. I guess i'll find out for sure with my virgin lot.
Interesting. Are we sure they aren't just referring to the 6.5 wildcat on the .222 Magnum case? (Memory is a little fuzzy here)