I think using the 20k Ultratrail route (similar to the TNR but raced) would be the way to do a loop....
I think maybe TNR route out and over Columbardo (because who would want to miss that?) then descend into the valley at Bussolino jump on the 20k route round to Prazzo. Then Reverse a bit of the TNR back north over to Sampeyre then Bracon, then head East out the mountains back towards the city
I think using the 20k Ultratrail route (similar to the TNR but raced) would be the way to do a loop....
I think maybe TNR route out and over Columbardo (because who would want to miss that?) then descend into the valley at Bussolino jump on the 20k route round to Prazzo. Then Reverse a bit of the TNR back north over to Sampeyre then Bracon, then head East out the mountains back towards the city