Let's see, Juro your first. Hard Mason tests about as true to size as most other leaders but to make sure I send my spools to the IGFA each year to have them tested prior to tarpon season.
MattS, yes I use SA packaged flurocarbon tapered leaders. They arn't perfect, the but end is only .026 diameter and I prefere a more stiff leader but they're as good as anything else on the market.
Hope I could help, ask if you need more info, Mel