I had a Blackstar barrel once and was not really impressed with it but you really can't judge a barrel manufacturer on a single barrel. It appears that many guys are shooting Hart, Lilja, Krieger or Shilen barrels (I'm sure I missed one). That alone makes me look closer at these barrels than one that appears less frequently at the shoots & matchs.
When deciding on a new cartridge for a custom rifle
it is not a bad idea to find a cartridge that has top quality brass available for it. Brass could become the weakest link in your accuracy package.
Just my thoughts.