It wets out a little more than lower percentage silver which can mean it's a little harder to build up as it goes quite runny but may not be a problem with a small torch as it won't be super hot.
We use 30% for main tube joints at work and 55% for bosses and brazeons
Thanks, sounds encourging! Does it matter how much silver is in the rods? The ones from ebay that I showed have 55%