Make the dough: In a large bowl, combine the warm water, warmed milk, shortening, and salt. Stir until the shortening dissolves. Add the flour, sugar, and yeast, and mix with a spoon or mixer until a shaggy dough forms.
Knead the dough: Turn the dough out onto a lightly floured surface and knead for 5-7 minutes, until smooth and elastic. If the dough feels sticky, add a little more flour by the tablespoon, but don't over-knead.
First rise: Place the dough in a greased bowl, turning it to coat in the oil. Cover the bowl with plastic wrap or a damp kitchen towel and let it rise in a warm place for about 1 hour, or until doubled in size.
Make the cinnamon swirl: While the dough rises, combine the raisins, softened butter, brown sugar, and cinnamon in a small bowl. Mix well to form a spreadable filling.
Assemble the bread: Roll out the risen dough on a lightly floured surface into a rectangle, about 12x18 inches. Spread the cinnamon filling evenly over the dough, leaving a 1-inch border around the edges.
Roll and rise: Starting from the long end, tightly roll up the dough to form a log. Pinch the edges to seal. Place the log, seam-side down, in a greased 9x5 inch loaf pan. Cover with plastic wrap or a damp towel and let it rise for another 30 minutes, or until almost doubled in size.
Bake: Preheat oven to 350°F (175°C). Brush the top of the risen dough with melted butter. Bake for 30-35 minutes, or until golden brown and a toothpick inserted into the center comes out clean.
Cool and enjoy: Let the bread cool in the pan for 10 minutes, then transfer it to a wire rack to cool completely before slicing and serving.