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Preheat oven to 400 degrees.
Combine flour, baking powder, baking soda, and salt in a large bowl.
Pull butter from refrigerator & cut cold butter in small cubes. Sprinkle on top of flour mixture. Using a pastry knife or 2 butter knives, cut the butter into the dry mix till pea sized chunks.
Add buttermilk slowly & tossing with a fork until dough is shaggy. Don't overwork & don't get too wet.
Smash about half of the blueberries. Add smashed & whole blueberries, zest, & sugar,
On a floured surface, push dough into a disk shape & cut into 12 triangles. Lay on baking sheet & brush with melted sugar & butter.
Bake 25 minutes. Looking for golden brown, but may be paler than expected